| /* GNU/Linux/x86-64 specific low level interface, for the remote server |
| for GDB. |
| Copyright (C) 2002-2015 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "server.h" |
| #include <signal.h> |
| #include <limits.h> |
| #include <inttypes.h> |
| #include "linux-low.h" |
| #include "i387-fp.h" |
| #include "x86-low.h" |
| #include "x86-xstate.h" |
| |
| #include "gdb_proc_service.h" |
| /* Don't include elf/common.h if linux/elf.h got included by |
| gdb_proc_service.h. */ |
| #ifndef ELFMAG0 |
| #include "elf/common.h" |
| #endif |
| |
| #include "agent.h" |
| #include "tdesc.h" |
| #include "tracepoint.h" |
| #include "ax.h" |
| |
| #ifdef __x86_64__ |
| /* Defined in auto-generated file amd64-linux.c. */ |
| void init_registers_amd64_linux (void); |
| extern const struct target_desc *tdesc_amd64_linux; |
| |
| /* Defined in auto-generated file amd64-avx-linux.c. */ |
| void init_registers_amd64_avx_linux (void); |
| extern const struct target_desc *tdesc_amd64_avx_linux; |
| |
| /* Defined in auto-generated file amd64-avx512-linux.c. */ |
| void init_registers_amd64_avx512_linux (void); |
| extern const struct target_desc *tdesc_amd64_avx512_linux; |
| |
| /* Defined in auto-generated file amd64-mpx-linux.c. */ |
| void init_registers_amd64_mpx_linux (void); |
| extern const struct target_desc *tdesc_amd64_mpx_linux; |
| |
| /* Defined in auto-generated file x32-linux.c. */ |
| void init_registers_x32_linux (void); |
| extern const struct target_desc *tdesc_x32_linux; |
| |
| /* Defined in auto-generated file x32-avx-linux.c. */ |
| void init_registers_x32_avx_linux (void); |
| extern const struct target_desc *tdesc_x32_avx_linux; |
| |
| /* Defined in auto-generated file x32-avx512-linux.c. */ |
| void init_registers_x32_avx512_linux (void); |
| extern const struct target_desc *tdesc_x32_avx512_linux; |
| |
| #endif |
| |
| /* Defined in auto-generated file i386-linux.c. */ |
| void init_registers_i386_linux (void); |
| extern const struct target_desc *tdesc_i386_linux; |
| |
| /* Defined in auto-generated file i386-mmx-linux.c. */ |
| void init_registers_i386_mmx_linux (void); |
| extern const struct target_desc *tdesc_i386_mmx_linux; |
| |
| /* Defined in auto-generated file i386-avx-linux.c. */ |
| void init_registers_i386_avx_linux (void); |
| extern const struct target_desc *tdesc_i386_avx_linux; |
| |
| /* Defined in auto-generated file i386-avx512-linux.c. */ |
| void init_registers_i386_avx512_linux (void); |
| extern const struct target_desc *tdesc_i386_avx512_linux; |
| |
| /* Defined in auto-generated file i386-mpx-linux.c. */ |
| void init_registers_i386_mpx_linux (void); |
| extern const struct target_desc *tdesc_i386_mpx_linux; |
| |
| #ifdef __x86_64__ |
| static struct target_desc *tdesc_amd64_linux_no_xml; |
| #endif |
| static struct target_desc *tdesc_i386_linux_no_xml; |
| |
| |
| static unsigned char jump_insn[] = { 0xe9, 0, 0, 0, 0 }; |
| static unsigned char small_jump_insn[] = { 0x66, 0xe9, 0, 0 }; |
| |
| /* Backward compatibility for gdb without XML support. */ |
| |
| static const char *xmltarget_i386_linux_no_xml = "@<target>\ |
| <architecture>i386</architecture>\ |
| <osabi>GNU/Linux</osabi>\ |
| </target>"; |
| |
| #ifdef __x86_64__ |
| static const char *xmltarget_amd64_linux_no_xml = "@<target>\ |
| <architecture>i386:x86-64</architecture>\ |
| <osabi>GNU/Linux</osabi>\ |
| </target>"; |
| #endif |
| |
| #include <sys/reg.h> |
| #include <sys/procfs.h> |
| #include <sys/ptrace.h> |
| #include <sys/uio.h> |
| |
| #ifndef PTRACE_GETREGSET |
| #define PTRACE_GETREGSET 0x4204 |
| #endif |
| |
| #ifndef PTRACE_SETREGSET |
| #define PTRACE_SETREGSET 0x4205 |
| #endif |
| |
| |
| #ifndef PTRACE_GET_THREAD_AREA |
| #define PTRACE_GET_THREAD_AREA 25 |
| #endif |
| |
| /* This definition comes from prctl.h, but some kernels may not have it. */ |
| #ifndef PTRACE_ARCH_PRCTL |
| #define PTRACE_ARCH_PRCTL 30 |
| #endif |
| |
| /* The following definitions come from prctl.h, but may be absent |
| for certain configurations. */ |
| #ifndef ARCH_GET_FS |
| #define ARCH_SET_GS 0x1001 |
| #define ARCH_SET_FS 0x1002 |
| #define ARCH_GET_FS 0x1003 |
| #define ARCH_GET_GS 0x1004 |
| #endif |
| |
| /* Per-process arch-specific data we want to keep. */ |
| |
| struct arch_process_info |
| { |
| struct x86_debug_reg_state debug_reg_state; |
| }; |
| |
| /* Per-thread arch-specific data we want to keep. */ |
| |
| struct arch_lwp_info |
| { |
| /* Non-zero if our copy differs from what's recorded in the thread. */ |
| int debug_registers_changed; |
| }; |
| |
| #ifdef __x86_64__ |
| |
| /* Mapping between the general-purpose registers in `struct user' |
| format and GDB's register array layout. |
| Note that the transfer layout uses 64-bit regs. */ |
| static /*const*/ int i386_regmap[] = |
| { |
| RAX * 8, RCX * 8, RDX * 8, RBX * 8, |
| RSP * 8, RBP * 8, RSI * 8, RDI * 8, |
| RIP * 8, EFLAGS * 8, CS * 8, SS * 8, |
| DS * 8, ES * 8, FS * 8, GS * 8 |
| }; |
| |
| #define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0])) |
| |
| /* So code below doesn't have to care, i386 or amd64. */ |
| #define ORIG_EAX ORIG_RAX |
| |
| static const int x86_64_regmap[] = |
| { |
| RAX * 8, RBX * 8, RCX * 8, RDX * 8, |
| RSI * 8, RDI * 8, RBP * 8, RSP * 8, |
| R8 * 8, R9 * 8, R10 * 8, R11 * 8, |
| R12 * 8, R13 * 8, R14 * 8, R15 * 8, |
| RIP * 8, EFLAGS * 8, CS * 8, SS * 8, |
| DS * 8, ES * 8, FS * 8, GS * 8, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| ORIG_RAX * 8, |
| -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */ |
| -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */ |
| -1, -1, -1, -1, -1, -1, -1, -1, /* xmm16 ... xmm31 (AVX512) */ |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, /* ymm16 ... ymm31 (AVX512) */ |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */ |
| -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm31 (AVX512) */ |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1 |
| }; |
| |
| #define X86_64_NUM_REGS (sizeof (x86_64_regmap) / sizeof (x86_64_regmap[0])) |
| #define X86_64_USER_REGS (GS + 1) |
| |
| #else /* ! __x86_64__ */ |
| |
| /* Mapping between the general-purpose registers in `struct user' |
| format and GDB's register array layout. */ |
| static /*const*/ int i386_regmap[] = |
| { |
| EAX * 4, ECX * 4, EDX * 4, EBX * 4, |
| UESP * 4, EBP * 4, ESI * 4, EDI * 4, |
| EIP * 4, EFL * 4, CS * 4, SS * 4, |
| DS * 4, ES * 4, FS * 4, GS * 4 |
| }; |
| |
| #define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0])) |
| |
| #endif |
| |
| #ifdef __x86_64__ |
| |
| /* Returns true if the current inferior belongs to a x86-64 process, |
| per the tdesc. */ |
| |
| static int |
| is_64bit_tdesc (void) |
| { |
| struct regcache *regcache = get_thread_regcache (current_thread, 0); |
| |
| return register_size (regcache->tdesc, 0) == 8; |
| } |
| |
| #endif |
| |
| |
| /* Called by libthread_db. */ |
| |
| ps_err_e |
| ps_get_thread_area (const struct ps_prochandle *ph, |
| lwpid_t lwpid, int idx, void **base) |
| { |
| #ifdef __x86_64__ |
| int use_64bit = is_64bit_tdesc (); |
| |
| if (use_64bit) |
| { |
| switch (idx) |
| { |
| case FS: |
| if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) |
| return PS_OK; |
| break; |
| case GS: |
| if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) |
| return PS_OK; |
| break; |
| default: |
| return PS_BADADDR; |
| } |
| return PS_ERR; |
| } |
| #endif |
| |
| { |
| unsigned int desc[4]; |
| |
| if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, |
| (void *) (intptr_t) idx, (unsigned long) &desc) < 0) |
| return PS_ERR; |
| |
| /* Ensure we properly extend the value to 64-bits for x86_64. */ |
| *base = (void *) (uintptr_t) desc[1]; |
| return PS_OK; |
| } |
| } |
| |
| /* Get the thread area address. This is used to recognize which |
| thread is which when tracing with the in-process agent library. We |
| don't read anything from the address, and treat it as opaque; it's |
| the address itself that we assume is unique per-thread. */ |
| |
| static int |
| x86_get_thread_area (int lwpid, CORE_ADDR *addr) |
| { |
| #ifdef __x86_64__ |
| int use_64bit = is_64bit_tdesc (); |
| |
| if (use_64bit) |
| { |
| void *base; |
| if (ptrace (PTRACE_ARCH_PRCTL, lwpid, &base, ARCH_GET_FS) == 0) |
| { |
| *addr = (CORE_ADDR) (uintptr_t) base; |
| return 0; |
| } |
| |
| return -1; |
| } |
| #endif |
| |
| { |
| struct lwp_info *lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
| struct thread_info *thr = get_lwp_thread (lwp); |
| struct regcache *regcache = get_thread_regcache (thr, 1); |
| unsigned int desc[4]; |
| ULONGEST gs = 0; |
| const int reg_thread_area = 3; /* bits to scale down register value. */ |
| int idx; |
| |
| collect_register_by_name (regcache, "gs", &gs); |
| |
| idx = gs >> reg_thread_area; |
| |
| if (ptrace (PTRACE_GET_THREAD_AREA, |
| lwpid_of (thr), |
| (void *) (long) idx, (unsigned long) &desc) < 0) |
| return -1; |
| |
| *addr = desc[1]; |
| return 0; |
| } |
| } |
| |
| |
| |
| static int |
| x86_cannot_store_register (int regno) |
| { |
| #ifdef __x86_64__ |
| if (is_64bit_tdesc ()) |
| return 0; |
| #endif |
| |
| return regno >= I386_NUM_REGS; |
| } |
| |
| static int |
| x86_cannot_fetch_register (int regno) |
| { |
| #ifdef __x86_64__ |
| if (is_64bit_tdesc ()) |
| return 0; |
| #endif |
| |
| return regno >= I386_NUM_REGS; |
| } |
| |
| static void |
| x86_fill_gregset (struct regcache *regcache, void *buf) |
| { |
| int i; |
| |
| #ifdef __x86_64__ |
| if (register_size (regcache->tdesc, 0) == 8) |
| { |
| for (i = 0; i < X86_64_NUM_REGS; i++) |
| if (x86_64_regmap[i] != -1) |
| collect_register (regcache, i, ((char *) buf) + x86_64_regmap[i]); |
| return; |
| } |
| |
| /* 32-bit inferior registers need to be zero-extended. |
| Callers would read uninitialized memory otherwise. */ |
| memset (buf, 0x00, X86_64_USER_REGS * 8); |
| #endif |
| |
| for (i = 0; i < I386_NUM_REGS; i++) |
| collect_register (regcache, i, ((char *) buf) + i386_regmap[i]); |
| |
| collect_register_by_name (regcache, "orig_eax", |
| ((char *) buf) + ORIG_EAX * 4); |
| } |
| |
| static void |
| x86_store_gregset (struct regcache *regcache, const void *buf) |
| { |
| int i; |
| |
| #ifdef __x86_64__ |
| if (register_size (regcache->tdesc, 0) == 8) |
| { |
| for (i = 0; i < X86_64_NUM_REGS; i++) |
| if (x86_64_regmap[i] != -1) |
| supply_register (regcache, i, ((char *) buf) + x86_64_regmap[i]); |
| return; |
| } |
| #endif |
| |
| for (i = 0; i < I386_NUM_REGS; i++) |
| supply_register (regcache, i, ((char *) buf) + i386_regmap[i]); |
| |
| supply_register_by_name (regcache, "orig_eax", |
| ((char *) buf) + ORIG_EAX * 4); |
| } |
| |
| static void |
| x86_fill_fpregset (struct regcache *regcache, void *buf) |
| { |
| #ifdef __x86_64__ |
| i387_cache_to_fxsave (regcache, buf); |
| #else |
| i387_cache_to_fsave (regcache, buf); |
| #endif |
| } |
| |
| static void |
| x86_store_fpregset (struct regcache *regcache, const void *buf) |
| { |
| #ifdef __x86_64__ |
| i387_fxsave_to_cache (regcache, buf); |
| #else |
| i387_fsave_to_cache (regcache, buf); |
| #endif |
| } |
| |
| #ifndef __x86_64__ |
| |
| static void |
| x86_fill_fpxregset (struct regcache *regcache, void *buf) |
| { |
| i387_cache_to_fxsave (regcache, buf); |
| } |
| |
| static void |
| x86_store_fpxregset (struct regcache *regcache, const void *buf) |
| { |
| i387_fxsave_to_cache (regcache, buf); |
| } |
| |
| #endif |
| |
| static void |
| x86_fill_xstateregset (struct regcache *regcache, void *buf) |
| { |
| i387_cache_to_xsave (regcache, buf); |
| } |
| |
| static void |
| x86_store_xstateregset (struct regcache *regcache, const void *buf) |
| { |
| i387_xsave_to_cache (regcache, buf); |
| } |
| |
| /* ??? The non-biarch i386 case stores all the i387 regs twice. |
| Once in i387_.*fsave.* and once in i387_.*fxsave.*. |
| This is, presumably, to handle the case where PTRACE_[GS]ETFPXREGS |
| doesn't work. IWBN to avoid the duplication in the case where it |
| does work. Maybe the arch_setup routine could check whether it works |
| and update the supported regsets accordingly. */ |
| |
| static struct regset_info x86_regsets[] = |
| { |
| #ifdef HAVE_PTRACE_GETREGS |
| { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
| GENERAL_REGS, |
| x86_fill_gregset, x86_store_gregset }, |
| { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_X86_XSTATE, 0, |
| EXTENDED_REGS, x86_fill_xstateregset, x86_store_xstateregset }, |
| # ifndef __x86_64__ |
| # ifdef HAVE_PTRACE_GETFPXREGS |
| { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, 0, sizeof (elf_fpxregset_t), |
| EXTENDED_REGS, |
| x86_fill_fpxregset, x86_store_fpxregset }, |
| # endif |
| # endif |
| { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t), |
| FP_REGS, |
| x86_fill_fpregset, x86_store_fpregset }, |
| #endif /* HAVE_PTRACE_GETREGS */ |
| { 0, 0, 0, -1, -1, NULL, NULL } |
| }; |
| |
| static CORE_ADDR |
| x86_get_pc (struct regcache *regcache) |
| { |
| int use_64bit = register_size (regcache->tdesc, 0) == 8; |
| |
| if (use_64bit) |
| { |
| unsigned long pc; |
| collect_register_by_name (regcache, "rip", &pc); |
| return (CORE_ADDR) pc; |
| } |
| else |
| { |
| unsigned int pc; |
| collect_register_by_name (regcache, "eip", &pc); |
| return (CORE_ADDR) pc; |
| } |
| } |
| |
| static void |
| x86_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| { |
| int use_64bit = register_size (regcache->tdesc, 0) == 8; |
| |
| if (use_64bit) |
| { |
| unsigned long newpc = pc; |
| supply_register_by_name (regcache, "rip", &newpc); |
| } |
| else |
| { |
| unsigned int newpc = pc; |
| supply_register_by_name (regcache, "eip", &newpc); |
| } |
| } |
| |
| static const unsigned char x86_breakpoint[] = { 0xCC }; |
| #define x86_breakpoint_len 1 |
| |
| static int |
| x86_breakpoint_at (CORE_ADDR pc) |
| { |
| unsigned char c; |
| |
| (*the_target->read_memory) (pc, &c, 1); |
| if (c == 0xCC) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* Support for debug registers. */ |
| |
| static unsigned long |
| x86_linux_dr_get (ptid_t ptid, int regnum) |
| { |
| int tid; |
| unsigned long value; |
| |
| tid = ptid_get_lwp (ptid); |
| |
| errno = 0; |
| value = ptrace (PTRACE_PEEKUSER, tid, |
| offsetof (struct user, u_debugreg[regnum]), 0); |
| if (errno != 0) |
| error ("Couldn't read debug register"); |
| |
| return value; |
| } |
| |
| static void |
| x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
| { |
| int tid; |
| |
| tid = ptid_get_lwp (ptid); |
| |
| errno = 0; |
| ptrace (PTRACE_POKEUSER, tid, |
| offsetof (struct user, u_debugreg[regnum]), value); |
| if (errno != 0) |
| error ("Couldn't write debug register"); |
| } |
| |
| static int |
| update_debug_registers_callback (struct inferior_list_entry *entry, |
| void *pid_p) |
| { |
| struct thread_info *thr = (struct thread_info *) entry; |
| struct lwp_info *lwp = get_thread_lwp (thr); |
| int pid = *(int *) pid_p; |
| |
| /* Only update the threads of this process. */ |
| if (pid_of (thr) == pid) |
| { |
| /* The actual update is done later just before resuming the lwp, |
| we just mark that the registers need updating. */ |
| lwp->arch_private->debug_registers_changed = 1; |
| |
| /* If the lwp isn't stopped, force it to momentarily pause, so |
| we can update its debug registers. */ |
| if (!lwp->stopped) |
| linux_stop_lwp (lwp); |
| } |
| |
| return 0; |
| } |
| |
| /* Update the inferior's debug register REGNUM from STATE. */ |
| |
| static void |
| x86_dr_low_set_addr (int regnum, CORE_ADDR addr) |
| { |
| /* Only update the threads of this process. */ |
| int pid = pid_of (current_thread); |
| |
| gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); |
| |
| find_inferior (&all_threads, update_debug_registers_callback, &pid); |
| } |
| |
| /* Return the inferior's debug register REGNUM. */ |
| |
| static CORE_ADDR |
| x86_dr_low_get_addr (int regnum) |
| { |
| ptid_t ptid = ptid_of (current_thread); |
| |
| gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); |
| |
| return x86_linux_dr_get (ptid, regnum); |
| } |
| |
| /* Update the inferior's DR7 debug control register from STATE. */ |
| |
| static void |
| x86_dr_low_set_control (unsigned long control) |
| { |
| /* Only update the threads of this process. */ |
| int pid = pid_of (current_thread); |
| |
| find_inferior (&all_threads, update_debug_registers_callback, &pid); |
| } |
| |
| /* Return the inferior's DR7 debug control register. */ |
| |
| static unsigned long |
| x86_dr_low_get_control (void) |
| { |
| ptid_t ptid = ptid_of (current_thread); |
| |
| return x86_linux_dr_get (ptid, DR_CONTROL); |
| } |
| |
| /* Get the value of the DR6 debug status register from the inferior |
| and record it in STATE. */ |
| |
| static unsigned long |
| x86_dr_low_get_status (void) |
| { |
| ptid_t ptid = ptid_of (current_thread); |
| |
| return x86_linux_dr_get (ptid, DR_STATUS); |
| } |
| |
| /* Low-level function vector. */ |
| struct x86_dr_low_type x86_dr_low = |
| { |
| x86_dr_low_set_control, |
| x86_dr_low_set_addr, |
| x86_dr_low_get_addr, |
| x86_dr_low_get_status, |
| x86_dr_low_get_control, |
| sizeof (void *), |
| }; |
| |
| /* Breakpoint/Watchpoint support. */ |
| |
| static int |
| x86_supports_z_point_type (char z_type) |
| { |
| switch (z_type) |
| { |
| case Z_PACKET_SW_BP: |
| case Z_PACKET_HW_BP: |
| case Z_PACKET_WRITE_WP: |
| case Z_PACKET_ACCESS_WP: |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| static int |
| x86_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, |
| int size, struct raw_breakpoint *bp) |
| { |
| struct process_info *proc = current_process (); |
| |
| switch (type) |
| { |
| case raw_bkpt_type_sw: |
| return insert_memory_breakpoint (bp); |
| |
| case raw_bkpt_type_hw: |
| case raw_bkpt_type_write_wp: |
| case raw_bkpt_type_access_wp: |
| { |
| enum target_hw_bp_type hw_type |
| = raw_bkpt_type_to_target_hw_bp_type (type); |
| struct x86_debug_reg_state *state |
| = &proc->private->arch_private->debug_reg_state; |
| |
| return x86_dr_insert_watchpoint (state, hw_type, addr, size); |
| } |
| |
| default: |
| /* Unsupported. */ |
| return 1; |
| } |
| } |
| |
| static int |
| x86_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
| int size, struct raw_breakpoint *bp) |
| { |
| struct process_info *proc = current_process (); |
| |
| switch (type) |
| { |
| case raw_bkpt_type_sw: |
| return remove_memory_breakpoint (bp); |
| |
| case raw_bkpt_type_hw: |
| case raw_bkpt_type_write_wp: |
| case raw_bkpt_type_access_wp: |
| { |
| enum target_hw_bp_type hw_type |
| = raw_bkpt_type_to_target_hw_bp_type (type); |
| struct x86_debug_reg_state *state |
| = &proc->private->arch_private->debug_reg_state; |
| |
| return x86_dr_remove_watchpoint (state, hw_type, addr, size); |
| } |
| default: |
| /* Unsupported. */ |
| return 1; |
| } |
| } |
| |
| static int |
| x86_stopped_by_watchpoint (void) |
| { |
| struct process_info *proc = current_process (); |
| return x86_dr_stopped_by_watchpoint (&proc->private->arch_private->debug_reg_state); |
| } |
| |
| static CORE_ADDR |
| x86_stopped_data_address (void) |
| { |
| struct process_info *proc = current_process (); |
| CORE_ADDR addr; |
| if (x86_dr_stopped_data_address (&proc->private->arch_private->debug_reg_state, |
| &addr)) |
| return addr; |
| return 0; |
| } |
| |
| /* Called when a new process is created. */ |
| |
| static struct arch_process_info * |
| x86_linux_new_process (void) |
| { |
| struct arch_process_info *info = XCNEW (struct arch_process_info); |
| |
| x86_low_init_dregs (&info->debug_reg_state); |
| |
| return info; |
| } |
| |
| /* Called when a new thread is detected. */ |
| |
| static struct arch_lwp_info * |
| x86_linux_new_thread (void) |
| { |
| struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); |
| |
| info->debug_registers_changed = 1; |
| |
| return info; |
| } |
| |
| /* Called when resuming a thread. |
| If the debug regs have changed, update the thread's copies. */ |
| |
| static void |
| x86_linux_prepare_to_resume (struct lwp_info *lwp) |
| { |
| ptid_t ptid = ptid_of (get_lwp_thread (lwp)); |
| int clear_status = 0; |
| |
| if (lwp->arch_private->debug_registers_changed) |
| { |
| int i; |
| int pid = ptid_get_pid (ptid); |
| struct process_info *proc = find_process_pid (pid); |
| struct x86_debug_reg_state *state |
| = &proc->private->arch_private->debug_reg_state; |
| |
| x86_linux_dr_set (ptid, DR_CONTROL, 0); |
| |
| ALL_DEBUG_ADDRESS_REGISTERS (i) |
| if (state->dr_ref_count[i] > 0) |
| { |
| x86_linux_dr_set (ptid, i, state->dr_mirror[i]); |
| |
| /* If we're setting a watchpoint, any change the inferior |
| had done itself to the debug registers needs to be |
| discarded, otherwise, x86_dr_stopped_data_address can |
| get confused. */ |
| clear_status = 1; |
| } |
| |
| if (state->dr_control_mirror != 0) |
| x86_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror); |
| |
| lwp->arch_private->debug_registers_changed = 0; |
| } |
| |
| if (clear_status || lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT) |
| x86_linux_dr_set (ptid, DR_STATUS, 0); |
| } |
| |
| /* When GDBSERVER is built as a 64-bit application on linux, the |
| PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since |
| debugging a 32-bit inferior with a 64-bit GDBSERVER should look the same |
| as debugging it with a 32-bit GDBSERVER, we do the 32-bit <-> 64-bit |
| conversion in-place ourselves. */ |
| |
| /* These types below (compat_*) define a siginfo type that is layout |
| compatible with the siginfo type exported by the 32-bit userspace |
| support. */ |
| |
| #ifdef __x86_64__ |
| |
| typedef int compat_int_t; |
| typedef unsigned int compat_uptr_t; |
| |
| typedef int compat_time_t; |
| typedef int compat_timer_t; |
| typedef int compat_clock_t; |
| |
| struct compat_timeval |
| { |
| compat_time_t tv_sec; |
| int tv_usec; |
| }; |
| |
| typedef union compat_sigval |
| { |
| compat_int_t sival_int; |
| compat_uptr_t sival_ptr; |
| } compat_sigval_t; |
| |
| typedef struct compat_siginfo |
| { |
| int si_signo; |
| int si_errno; |
| int si_code; |
| |
| union |
| { |
| int _pad[((128 / sizeof (int)) - 3)]; |
| |
| /* kill() */ |
| struct |
| { |
| unsigned int _pid; |
| unsigned int _uid; |
| } _kill; |
| |
| /* POSIX.1b timers */ |
| struct |
| { |
| compat_timer_t _tid; |
| int _overrun; |
| compat_sigval_t _sigval; |
| } _timer; |
| |
| /* POSIX.1b signals */ |
| struct |
| { |
| unsigned int _pid; |
| unsigned int _uid; |
| compat_sigval_t _sigval; |
| } _rt; |
| |
| /* SIGCHLD */ |
| struct |
| { |
| unsigned int _pid; |
| unsigned int _uid; |
| int _status; |
| compat_clock_t _utime; |
| compat_clock_t _stime; |
| } _sigchld; |
| |
| /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ |
| struct |
| { |
| unsigned int _addr; |
| } _sigfault; |
| |
| /* SIGPOLL */ |
| struct |
| { |
| int _band; |
| int _fd; |
| } _sigpoll; |
| } _sifields; |
| } compat_siginfo_t; |
| |
| /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */ |
| typedef long __attribute__ ((__aligned__ (4))) compat_x32_clock_t; |
| |
| typedef struct compat_x32_siginfo |
| { |
| int si_signo; |
| int si_errno; |
| int si_code; |
| |
| union |
| { |
| int _pad[((128 / sizeof (int)) - 3)]; |
| |
| /* kill() */ |
| struct |
| { |
| unsigned int _pid; |
| unsigned int _uid; |
| } _kill; |
| |
| /* POSIX.1b timers */ |
| struct |
| { |
| compat_timer_t _tid; |
| int _overrun; |
| compat_sigval_t _sigval; |
| } _timer; |
| |
| /* POSIX.1b signals */ |
| struct |
| { |
| unsigned int _pid; |
| unsigned int _uid; |
| compat_sigval_t _sigval; |
| } _rt; |
| |
| /* SIGCHLD */ |
| struct |
| { |
| unsigned int _pid; |
| unsigned int _uid; |
| int _status; |
| compat_x32_clock_t _utime; |
| compat_x32_clock_t _stime; |
| } _sigchld; |
| |
| /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ |
| struct |
| { |
| unsigned int _addr; |
| } _sigfault; |
| |
| /* SIGPOLL */ |
| struct |
| { |
| int _band; |
| int _fd; |
| } _sigpoll; |
| } _sifields; |
| } compat_x32_siginfo_t __attribute__ ((__aligned__ (8))); |
| |
| #define cpt_si_pid _sifields._kill._pid |
| #define cpt_si_uid _sifields._kill._uid |
| #define cpt_si_timerid _sifields._timer._tid |
| #define cpt_si_overrun _sifields._timer._overrun |
| #define cpt_si_status _sifields._sigchld._status |
| #define cpt_si_utime _sifields._sigchld._utime |
| #define cpt_si_stime _sifields._sigchld._stime |
| #define cpt_si_ptr _sifields._rt._sigval.sival_ptr |
| #define cpt_si_addr _sifields._sigfault._addr |
| #define cpt_si_band _sifields._sigpoll._band |
| #define cpt_si_fd _sifields._sigpoll._fd |
| |
| /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun. |
| In their place is si_timer1,si_timer2. */ |
| #ifndef si_timerid |
| #define si_timerid si_timer1 |
| #endif |
| #ifndef si_overrun |
| #define si_overrun si_timer2 |
| #endif |
| |
| static void |
| compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from) |
| { |
| memset (to, 0, sizeof (*to)); |
| |
| to->si_signo = from->si_signo; |
| to->si_errno = from->si_errno; |
| to->si_code = from->si_code; |
| |
| if (to->si_code == SI_TIMER) |
| { |
| to->cpt_si_timerid = from->si_timerid; |
| to->cpt_si_overrun = from->si_overrun; |
| to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| } |
| else if (to->si_code == SI_USER) |
| { |
| to->cpt_si_pid = from->si_pid; |
| to->cpt_si_uid = from->si_uid; |
| } |
| else if (to->si_code < 0) |
| { |
| to->cpt_si_pid = from->si_pid; |
| to->cpt_si_uid = from->si_uid; |
| to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| } |
| else |
| { |
| switch (to->si_signo) |
| { |
| case SIGCHLD: |
| to->cpt_si_pid = from->si_pid; |
| to->cpt_si_uid = from->si_uid; |
| to->cpt_si_status = from->si_status; |
| to->cpt_si_utime = from->si_utime; |
| to->cpt_si_stime = from->si_stime; |
| break; |
| case SIGILL: |
| case SIGFPE: |
| case SIGSEGV: |
| case SIGBUS: |
| to->cpt_si_addr = (intptr_t) from->si_addr; |
| break; |
| case SIGPOLL: |
| to->cpt_si_band = from->si_band; |
| to->cpt_si_fd = from->si_fd; |
| break; |
| default: |
| to->cpt_si_pid = from->si_pid; |
| to->cpt_si_uid = from->si_uid; |
| to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| break; |
| } |
| } |
| } |
| |
| static void |
| siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from) |
| { |
| memset (to, 0, sizeof (*to)); |
| |
| to->si_signo = from->si_signo; |
| to->si_errno = from->si_errno; |
| to->si_code = from->si_code; |
| |
| if (to->si_code == SI_TIMER) |
| { |
| to->si_timerid = from->cpt_si_timerid; |
| to->si_overrun = from->cpt_si_overrun; |
| to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| } |
| else if (to->si_code == SI_USER) |
| { |
| to->si_pid = from->cpt_si_pid; |
| to->si_uid = from->cpt_si_uid; |
| } |
| else if (to->si_code < 0) |
| { |
| to->si_pid = from->cpt_si_pid; |
| to->si_uid = from->cpt_si_uid; |
| to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| } |
| else |
| { |
| switch (to->si_signo) |
| { |
| case SIGCHLD: |
| to->si_pid = from->cpt_si_pid; |
| to->si_uid = from->cpt_si_uid; |
| to->si_status = from->cpt_si_status; |
| to->si_utime = from->cpt_si_utime; |
| to->si_stime = from->cpt_si_stime; |
| break; |
| case SIGILL: |
| case SIGFPE: |
| case SIGSEGV: |
| case SIGBUS: |
| to->si_addr = (void *) (intptr_t) from->cpt_si_addr; |
| break; |
| case SIGPOLL: |
| to->si_band = from->cpt_si_band; |
| to->si_fd = from->cpt_si_fd; |
| break; |
| default: |
| to->si_pid = from->cpt_si_pid; |
| to->si_uid = from->cpt_si_uid; |
| to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; |
| break; |
| } |
| } |
| } |
| |
| static void |
| compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to, |
| siginfo_t *from) |
| { |
| memset (to, 0, sizeof (*to)); |
| |
| to->si_signo = from->si_signo; |
| to->si_errno = from->si_errno; |
| to->si_code = from->si_code; |
| |
| if (to->si_code == SI_TIMER) |
| { |
| to->cpt_si_timerid = from->si_timerid; |
| to->cpt_si_overrun = from->si_overrun; |
| to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| } |
| else if (to->si_code == SI_USER) |
| { |
| to->cpt_si_pid = from->si_pid; |
| to->cpt_si_uid = from->si_uid; |
| } |
| else if (to->si_code < 0) |
| { |
| to->cpt_si_pid = from->si_pid; |
| to->cpt_si_uid = from->si_uid; |
| to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| } |
| else |
| { |
| switch (to->si_signo) |
| { |
| case SIGCHLD: |
| to->cpt_si_pid = from->si_pid; |
| to->cpt_si_uid = from->si_uid; |
| to->cpt_si_status = from->si_status; |
| to->cpt_si_utime = from->si_utime; |
| to->cpt_si_stime = from->si_stime; |
| break; |
| case SIGILL: |
| case SIGFPE: |
| case SIGSEGV: |
| case SIGBUS: |
| to->cpt_si_addr = (intptr_t) from->si_addr; |
| break; |
| case SIGPOLL: |
| to->cpt_si_band = from->si_band; |
| to->cpt_si_fd = from->si_fd; |
| break; |
| default: |
| to->cpt_si_pid = from->si_pid; |
| to->cpt_si_uid = from->si_uid; |
| to->cpt_si_ptr = (intptr_t) from->si_ptr; |
| break; |
| } |
| } |
| } |
| |
| static void |
| siginfo_from_compat_x32_siginfo (siginfo_t *to, |
| compat_x32_siginfo_t *from) |
| { |
| memset (to, 0, sizeof (*to)); |
| |
| to->si_signo = from->si_signo; |
| to->si_errno = from->si_errno; |
| to->si_code = from->si_code; |
| |
| if (to->si_code == SI_TIMER) |
| { |
| to->si_timerid = from->cpt_si_timerid; |
| to->si_overrun = from->cpt_si_overrun; |
| to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| } |
| else if (to->si_code == SI_USER) |
| { |
| to->si_pid = from->cpt_si_pid; |
| to->si_uid = from->cpt_si_uid; |
| } |
| else if (to->si_code < 0) |
| { |
| to->si_pid = from->cpt_si_pid; |
| to->si_uid = from->cpt_si_uid; |
| to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr; |
| } |
| else |
| { |
| switch (to->si_signo) |
| { |
| case SIGCHLD: |
| to->si_pid = from->cpt_si_pid; |
| to->si_uid = from->cpt_si_uid; |
| to->si_status = from->cpt_si_status; |
| to->si_utime = from->cpt_si_utime; |
| to->si_stime = from->cpt_si_stime; |
| break; |
| case SIGILL: |
| case SIGFPE: |
| case SIGSEGV: |
| case SIGBUS: |
| to->si_addr = (void *) (intptr_t) from->cpt_si_addr; |
| break; |
| case SIGPOLL: |
| to->si_band = from->cpt_si_band; |
| to->si_fd = from->cpt_si_fd; |
| break; |
| default: |
| to->si_pid = from->cpt_si_pid; |
| to->si_uid = from->cpt_si_uid; |
| to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; |
| break; |
| } |
| } |
| } |
| |
| #endif /* __x86_64__ */ |
| |
| /* Convert a native/host siginfo object, into/from the siginfo in the |
| layout of the inferiors' architecture. Returns true if any |
| conversion was done; false otherwise. If DIRECTION is 1, then copy |
| from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to |
| INF. */ |
| |
| static int |
| x86_siginfo_fixup (siginfo_t *native, void *inf, int direction) |
| { |
| #ifdef __x86_64__ |
| unsigned int machine; |
| int tid = lwpid_of (current_thread); |
| int is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine); |
| |
| /* Is the inferior 32-bit? If so, then fixup the siginfo object. */ |
| if (!is_64bit_tdesc ()) |
| { |
| gdb_assert (sizeof (siginfo_t) == sizeof (compat_siginfo_t)); |
| |
| if (direction == 0) |
| compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native); |
| else |
| siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf); |
| |
| return 1; |
| } |
| /* No fixup for native x32 GDB. */ |
| else if (!is_elf64 && sizeof (void *) == 8) |
| { |
| gdb_assert (sizeof (siginfo_t) == sizeof (compat_x32_siginfo_t)); |
| |
| if (direction == 0) |
| compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo *) inf, |
| native); |
| else |
| siginfo_from_compat_x32_siginfo (native, |
| (struct compat_x32_siginfo *) inf); |
| |
| return 1; |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| static int use_xml; |
| |
| /* Format of XSAVE extended state is: |
| struct |
| { |
| fxsave_bytes[0..463] |
| sw_usable_bytes[464..511] |
| xstate_hdr_bytes[512..575] |
| avx_bytes[576..831] |
| future_state etc |
| }; |
| |
| Same memory layout will be used for the coredump NT_X86_XSTATE |
| representing the XSAVE extended state registers. |
| |
| The first 8 bytes of the sw_usable_bytes[464..467] is the OS enabled |
| extended state mask, which is the same as the extended control register |
| 0 (the XFEATURE_ENABLED_MASK register), XCR0. We can use this mask |
| together with the mask saved in the xstate_hdr_bytes to determine what |
| states the processor/OS supports and what state, used or initialized, |
| the process/thread is in. */ |
| #define I386_LINUX_XSAVE_XCR0_OFFSET 464 |
| |
| /* Does the current host support the GETFPXREGS request? The header |
| file may or may not define it, and even if it is defined, the |
| kernel will return EIO if it's running on a pre-SSE processor. */ |
| int have_ptrace_getfpxregs = |
| #ifdef HAVE_PTRACE_GETFPXREGS |
| -1 |
| #else |
| 0 |
| #endif |
| ; |
| |
| /* Does the current host support PTRACE_GETREGSET? */ |
| static int have_ptrace_getregset = -1; |
| |
| /* Get Linux/x86 target description from running target. */ |
| |
| static const struct target_desc * |
| x86_linux_read_description (void) |
| { |
| unsigned int machine; |
| int is_elf64; |
| int xcr0_features; |
| int tid; |
| static uint64_t xcr0; |
| struct regset_info *regset; |
| |
| tid = lwpid_of (current_thread); |
| |
| is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine); |
| |
| if (sizeof (void *) == 4) |
| { |
| if (is_elf64 > 0) |
| error (_("Can't debug 64-bit process with 32-bit GDBserver")); |
| #ifndef __x86_64__ |
| else if (machine == EM_X86_64) |
| error (_("Can't debug x86-64 process with 32-bit GDBserver")); |
| #endif |
| } |
| |
| #if !defined __x86_64__ && defined HAVE_PTRACE_GETFPXREGS |
| if (machine == EM_386 && have_ptrace_getfpxregs == -1) |
| { |
| elf_fpxregset_t fpxregs; |
| |
| if (ptrace (PTRACE_GETFPXREGS, tid, 0, (long) &fpxregs) < 0) |
| { |
| have_ptrace_getfpxregs = 0; |
| have_ptrace_getregset = 0; |
| return tdesc_i386_mmx_linux; |
| } |
| else |
| have_ptrace_getfpxregs = 1; |
| } |
| #endif |
| |
| if (!use_xml) |
| { |
| x86_xcr0 = X86_XSTATE_SSE_MASK; |
| |
| /* Don't use XML. */ |
| #ifdef __x86_64__ |
| if (machine == EM_X86_64) |
| return tdesc_amd64_linux_no_xml; |
| else |
| #endif |
| return tdesc_i386_linux_no_xml; |
| } |
| |
| if (have_ptrace_getregset == -1) |
| { |
| uint64_t xstateregs[(X86_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
| struct iovec iov; |
| |
| iov.iov_base = xstateregs; |
| iov.iov_len = sizeof (xstateregs); |
| |
| /* Check if PTRACE_GETREGSET works. */ |
| if (ptrace (PTRACE_GETREGSET, tid, |
| (unsigned int) NT_X86_XSTATE, (long) &iov) < 0) |
| have_ptrace_getregset = 0; |
| else |
| { |
| have_ptrace_getregset = 1; |
| |
| /* Get XCR0 from XSAVE extended state. */ |
| xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET |
| / sizeof (uint64_t))]; |
| |
| /* Use PTRACE_GETREGSET if it is available. */ |
| for (regset = x86_regsets; |
| regset->fill_function != NULL; regset++) |
| if (regset->get_request == PTRACE_GETREGSET) |
| regset->size = X86_XSTATE_SIZE (xcr0); |
| else if (regset->type != GENERAL_REGS) |
| regset->size = 0; |
| } |
| } |
| |
| /* Check the native XCR0 only if PTRACE_GETREGSET is available. */ |
| xcr0_features = (have_ptrace_getregset |
| && (xcr0 & X86_XSTATE_ALL_MASK)); |
| |
| if (xcr0_features) |
| x86_xcr0 = xcr0; |
| |
| if (machine == EM_X86_64) |
| { |
| #ifdef __x86_64__ |
| if (is_elf64) |
| { |
| if (xcr0_features) |
| { |
| switch (xcr0 & X86_XSTATE_ALL_MASK) |
| { |
| case X86_XSTATE_AVX512_MASK: |
| return tdesc_amd64_avx512_linux; |
| |
| case X86_XSTATE_MPX_MASK: |
| return tdesc_amd64_mpx_linux; |
| |
| case X86_XSTATE_AVX_MASK: |
| return tdesc_amd64_avx_linux; |
| |
| default: |
| return tdesc_amd64_linux; |
| } |
| } |
| else |
| return tdesc_amd64_linux; |
| } |
| else |
| { |
| if (xcr0_features) |
| { |
| switch (xcr0 & X86_XSTATE_ALL_MASK) |
| { |
| case X86_XSTATE_AVX512_MASK: |
| return tdesc_x32_avx512_linux; |
| |
| case X86_XSTATE_MPX_MASK: /* No MPX on x32. */ |
| case X86_XSTATE_AVX_MASK: |
| return tdesc_x32_avx_linux; |
| |
| default: |
| return tdesc_x32_linux; |
| } |
| } |
| else |
| return tdesc_x32_linux; |
| } |
| #endif |
| } |
| else |
| { |
| if (xcr0_features) |
| { |
| switch (xcr0 & X86_XSTATE_ALL_MASK) |
| { |
| case (X86_XSTATE_AVX512_MASK): |
| return tdesc_i386_avx512_linux; |
| |
| case (X86_XSTATE_MPX_MASK): |
| return tdesc_i386_mpx_linux; |
| |
| case (X86_XSTATE_AVX_MASK): |
| return tdesc_i386_avx_linux; |
| |
| default: |
| return tdesc_i386_linux; |
| } |
| } |
| else |
| return tdesc_i386_linux; |
| } |
| |
| gdb_assert_not_reached ("failed to return tdesc"); |
| } |
| |
| /* Callback for find_inferior. Stops iteration when a thread with a |
| given PID is found. */ |
| |
| static int |
| same_process_callback (struct inferior_list_entry *entry, void *data) |
| { |
| int pid = *(int *) data; |
| |
| return (ptid_get_pid (entry->id) == pid); |
| } |
| |
| /* Callback for for_each_inferior. Calls the arch_setup routine for |
| each process. */ |
| |
| static void |
| x86_arch_setup_process_callback (struct inferior_list_entry *entry) |
| { |
| int pid = ptid_get_pid (entry->id); |
| |
| /* Look up any thread of this processes. */ |
| current_thread |
| = (struct thread_info *) find_inferior (&all_threads, |
| same_process_callback, &pid); |
| |
| the_low_target.arch_setup (); |
| } |
| |
| /* Update all the target description of all processes; a new GDB |
| connected, and it may or not support xml target descriptions. */ |
| |
| static void |
| x86_linux_update_xmltarget (void) |
| { |
| struct thread_info *saved_thread = current_thread; |
| |
| /* Before changing the register cache's internal layout, flush the |
| contents of the current valid caches back to the threads, and |
| release the current regcache objects. */ |
| regcache_release (); |
| |
| for_each_inferior (&all_processes, x86_arch_setup_process_callback); |
| |
| current_thread = saved_thread; |
| } |
| |
| /* Process qSupported query, "xmlRegisters=". Update the buffer size for |
| PTRACE_GETREGSET. */ |
| |
| static void |
| x86_linux_process_qsupported (const char *query) |
| { |
| /* Return if gdb doesn't support XML. If gdb sends "xmlRegisters=" |
| with "i386" in qSupported query, it supports x86 XML target |
| descriptions. */ |
| use_xml = 0; |
| if (query != NULL && strncmp (query, "xmlRegisters=", 13) == 0) |
| { |
| char *copy = xstrdup (query + 13); |
| char *p; |
| |
| for (p = strtok (copy, ","); p != NULL; p = strtok (NULL, ",")) |
| { |
| if (strcmp (p, "i386") == 0) |
| { |
| use_xml = 1; |
| break; |
| } |
| } |
| |
| free (copy); |
| } |
| |
| x86_linux_update_xmltarget (); |
| } |
| |
| /* Common for x86/x86-64. */ |
| |
| static struct regsets_info x86_regsets_info = |
| { |
| x86_regsets, /* regsets */ |
| 0, /* num_regsets */ |
| NULL, /* disabled_regsets */ |
| }; |
| |
| #ifdef __x86_64__ |
| static struct regs_info amd64_linux_regs_info = |
| { |
| NULL, /* regset_bitmap */ |
| NULL, /* usrregs_info */ |
| &x86_regsets_info |
| }; |
| #endif |
| static struct usrregs_info i386_linux_usrregs_info = |
| { |
| I386_NUM_REGS, |
| i386_regmap, |
| }; |
| |
| static struct regs_info i386_linux_regs_info = |
| { |
| NULL, /* regset_bitmap */ |
| &i386_linux_usrregs_info, |
| &x86_regsets_info |
| }; |
| |
| const struct regs_info * |
| x86_linux_regs_info (void) |
| { |
| #ifdef __x86_64__ |
| if (is_64bit_tdesc ()) |
| return &amd64_linux_regs_info; |
| else |
| #endif |
| return &i386_linux_regs_info; |
| } |
| |
| /* Initialize the target description for the architecture of the |
| inferior. */ |
| |
| static void |
| x86_arch_setup (void) |
| { |
| current_process ()->tdesc = x86_linux_read_description (); |
| } |
| |
| static int |
| x86_supports_tracepoints (void) |
| { |
| return 1; |
| } |
| |
| static void |
| append_insns (CORE_ADDR *to, size_t len, const unsigned char *buf) |
| { |
| write_inferior_memory (*to, buf, len); |
| *to += len; |
| } |
| |
| static int |
| push_opcode (unsigned char *buf, char *op) |
| { |
| unsigned char *buf_org = buf; |
| |
| while (1) |
| { |
| char *endptr; |
| unsigned long ul = strtoul (op, &endptr, 16); |
| |
| if (endptr == op) |
| break; |
| |
| *buf++ = ul; |
| op = endptr; |
| } |
| |
| return buf - buf_org; |
| } |
| |
| #ifdef __x86_64__ |
| |
| /* Build a jump pad that saves registers and calls a collection |
| function. Writes a jump instruction to the jump pad to |
| JJUMPAD_INSN. The caller is responsible to write it in at the |
| tracepoint address. */ |
| |
| static int |
| amd64_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, |
| CORE_ADDR collector, |
| CORE_ADDR lockaddr, |
| ULONGEST orig_size, |
| CORE_ADDR *jump_entry, |
| CORE_ADDR *trampoline, |
| ULONGEST *trampoline_size, |
| unsigned char *jjump_pad_insn, |
| ULONGEST *jjump_pad_insn_size, |
| CORE_ADDR *adjusted_insn_addr, |
| CORE_ADDR *adjusted_insn_addr_end, |
| char *err) |
| { |
| unsigned char buf[40]; |
| int i, offset; |
| int64_t loffset; |
| |
| CORE_ADDR buildaddr = *jump_entry; |
| |
| /* Build the jump pad. */ |
| |
| /* First, do tracepoint data collection. Save registers. */ |
| i = 0; |
| /* Need to ensure stack pointer saved first. */ |
| buf[i++] = 0x54; /* push %rsp */ |
| buf[i++] = 0x55; /* push %rbp */ |
| buf[i++] = 0x57; /* push %rdi */ |
| buf[i++] = 0x56; /* push %rsi */ |
| buf[i++] = 0x52; /* push %rdx */ |
| buf[i++] = 0x51; /* push %rcx */ |
| buf[i++] = 0x53; /* push %rbx */ |
| buf[i++] = 0x50; /* push %rax */ |
| buf[i++] = 0x41; buf[i++] = 0x57; /* push %r15 */ |
| buf[i++] = 0x41; buf[i++] = 0x56; /* push %r14 */ |
| buf[i++] = 0x41; buf[i++] = 0x55; /* push %r13 */ |
| buf[i++] = 0x41; buf[i++] = 0x54; /* push %r12 */ |
| buf[i++] = 0x41; buf[i++] = 0x53; /* push %r11 */ |
| buf[i++] = 0x41; buf[i++] = 0x52; /* push %r10 */ |
| buf[i++] = 0x41; buf[i++] = 0x51; /* push %r9 */ |
| buf[i++] = 0x41; buf[i++] = 0x50; /* push %r8 */ |
| buf[i++] = 0x9c; /* pushfq */ |
| buf[i++] = 0x48; /* movl <addr>,%rdi */ |
| buf[i++] = 0xbf; |
| *((unsigned long *)(buf + i)) = (unsigned long) tpaddr; |
| i += sizeof (unsigned long); |
| buf[i++] = 0x57; /* push %rdi */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* Stack space for the collecting_t object. */ |
| i = 0; |
| i += push_opcode (&buf[i], "48 83 ec 18"); /* sub $0x18,%rsp */ |
| i += push_opcode (&buf[i], "48 b8"); /* mov <tpoint>,%rax */ |
| memcpy (buf + i, &tpoint, 8); |
| i += 8; |
| i += push_opcode (&buf[i], "48 89 04 24"); /* mov %rax,(%rsp) */ |
| i += push_opcode (&buf[i], |
| "64 48 8b 04 25 00 00 00 00"); /* mov %fs:0x0,%rax */ |
| i += push_opcode (&buf[i], "48 89 44 24 08"); /* mov %rax,0x8(%rsp) */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* spin-lock. */ |
| i = 0; |
| i += push_opcode (&buf[i], "48 be"); /* movl <lockaddr>,%rsi */ |
| memcpy (&buf[i], (void *) &lockaddr, 8); |
| i += 8; |
| i += push_opcode (&buf[i], "48 89 e1"); /* mov %rsp,%rcx */ |
| i += push_opcode (&buf[i], "31 c0"); /* xor %eax,%eax */ |
| i += push_opcode (&buf[i], "f0 48 0f b1 0e"); /* lock cmpxchg %rcx,(%rsi) */ |
| i += push_opcode (&buf[i], "48 85 c0"); /* test %rax,%rax */ |
| i += push_opcode (&buf[i], "75 f4"); /* jne <again> */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* Set up the gdb_collect call. */ |
| /* At this point, (stack pointer + 0x18) is the base of our saved |
| register block. */ |
| |
| i = 0; |
| i += push_opcode (&buf[i], "48 89 e6"); /* mov %rsp,%rsi */ |
| i += push_opcode (&buf[i], "48 83 c6 18"); /* add $0x18,%rsi */ |
| |
| /* tpoint address may be 64-bit wide. */ |
| i += push_opcode (&buf[i], "48 bf"); /* movl <addr>,%rdi */ |
| memcpy (buf + i, &tpoint, 8); |
| i += 8; |
| append_insns (&buildaddr, i, buf); |
| |
| /* The collector function being in the shared library, may be |
| >31-bits away off the jump pad. */ |
| i = 0; |
| i += push_opcode (&buf[i], "48 b8"); /* mov $collector,%rax */ |
| memcpy (buf + i, &collector, 8); |
| i += 8; |
| i += push_opcode (&buf[i], "ff d0"); /* callq *%rax */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* Clear the spin-lock. */ |
| i = 0; |
| i += push_opcode (&buf[i], "31 c0"); /* xor %eax,%eax */ |
| i += push_opcode (&buf[i], "48 a3"); /* mov %rax, lockaddr */ |
| memcpy (buf + i, &lockaddr, 8); |
| i += 8; |
| append_insns (&buildaddr, i, buf); |
| |
| /* Remove stack that had been used for the collect_t object. */ |
| i = 0; |
| i += push_opcode (&buf[i], "48 83 c4 18"); /* add $0x18,%rsp */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* Restore register state. */ |
| i = 0; |
| buf[i++] = 0x48; /* add $0x8,%rsp */ |
| buf[i++] = 0x83; |
| buf[i++] = 0xc4; |
| buf[i++] = 0x08; |
| buf[i++] = 0x9d; /* popfq */ |
| buf[i++] = 0x41; buf[i++] = 0x58; /* pop %r8 */ |
| buf[i++] = 0x41; buf[i++] = 0x59; /* pop %r9 */ |
| buf[i++] = 0x41; buf[i++] = 0x5a; /* pop %r10 */ |
| buf[i++] = 0x41; buf[i++] = 0x5b; /* pop %r11 */ |
| buf[i++] = 0x41; buf[i++] = 0x5c; /* pop %r12 */ |
| buf[i++] = 0x41; buf[i++] = 0x5d; /* pop %r13 */ |
| buf[i++] = 0x41; buf[i++] = 0x5e; /* pop %r14 */ |
| buf[i++] = 0x41; buf[i++] = 0x5f; /* pop %r15 */ |
| buf[i++] = 0x58; /* pop %rax */ |
| buf[i++] = 0x5b; /* pop %rbx */ |
| buf[i++] = 0x59; /* pop %rcx */ |
| buf[i++] = 0x5a; /* pop %rdx */ |
| buf[i++] = 0x5e; /* pop %rsi */ |
| buf[i++] = 0x5f; /* pop %rdi */ |
| buf[i++] = 0x5d; /* pop %rbp */ |
| buf[i++] = 0x5c; /* pop %rsp */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* Now, adjust the original instruction to execute in the jump |
| pad. */ |
| *adjusted_insn_addr = buildaddr; |
| relocate_instruction (&buildaddr, tpaddr); |
| *adjusted_insn_addr_end = buildaddr; |
| |
| /* Finally, write a jump back to the program. */ |
| |
| loffset = (tpaddr + orig_size) - (buildaddr + sizeof (jump_insn)); |
| if (loffset > INT_MAX || loffset < INT_MIN) |
| { |
| sprintf (err, |
| "E.Jump back from jump pad too far from tracepoint " |
| "(offset 0x%" PRIx64 " > int32).", loffset); |
| return 1; |
| } |
| |
| offset = (int) loffset; |
| memcpy (buf, jump_insn, sizeof (jump_insn)); |
| memcpy (buf + 1, &offset, 4); |
| append_insns (&buildaddr, sizeof (jump_insn), buf); |
| |
| /* The jump pad is now built. Wire in a jump to our jump pad. This |
| is always done last (by our caller actually), so that we can |
| install fast tracepoints with threads running. This relies on |
| the agent's atomic write support. */ |
| loffset = *jump_entry - (tpaddr + sizeof (jump_insn)); |
| if (loffset > INT_MAX || loffset < INT_MIN) |
| { |
| sprintf (err, |
| "E.Jump pad too far from tracepoint " |
| "(offset 0x%" PRIx64 " > int32).", loffset); |
| return 1; |
| } |
| |
| offset = (int) loffset; |
| |
| memcpy (buf, jump_insn, sizeof (jump_insn)); |
| memcpy (buf + 1, &offset, 4); |
| memcpy (jjump_pad_insn, buf, sizeof (jump_insn)); |
| *jjump_pad_insn_size = sizeof (jump_insn); |
| |
| /* Return the end address of our pad. */ |
| *jump_entry = buildaddr; |
| |
| return 0; |
| } |
| |
| #endif /* __x86_64__ */ |
| |
| /* Build a jump pad that saves registers and calls a collection |
| function. Writes a jump instruction to the jump pad to |
| JJUMPAD_INSN. The caller is responsible to write it in at the |
| tracepoint address. */ |
| |
| static int |
| i386_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, |
| CORE_ADDR collector, |
| CORE_ADDR lockaddr, |
| ULONGEST orig_size, |
| CORE_ADDR *jump_entry, |
| CORE_ADDR *trampoline, |
| ULONGEST *trampoline_size, |
| unsigned char *jjump_pad_insn, |
| ULONGEST *jjump_pad_insn_size, |
| CORE_ADDR *adjusted_insn_addr, |
| CORE_ADDR *adjusted_insn_addr_end, |
| char *err) |
| { |
| unsigned char buf[0x100]; |
| int i, offset; |
| CORE_ADDR buildaddr = *jump_entry; |
| |
| /* Build the jump pad. */ |
| |
| /* First, do tracepoint data collection. Save registers. */ |
| i = 0; |
| buf[i++] = 0x60; /* pushad */ |
| buf[i++] = 0x68; /* push tpaddr aka $pc */ |
| *((int *)(buf + i)) = (int) tpaddr; |
| i += 4; |
| buf[i++] = 0x9c; /* pushf */ |
| buf[i++] = 0x1e; /* push %ds */ |
| buf[i++] = 0x06; /* push %es */ |
| buf[i++] = 0x0f; /* push %fs */ |
| buf[i++] = 0xa0; |
| buf[i++] = 0x0f; /* push %gs */ |
| buf[i++] = 0xa8; |
| buf[i++] = 0x16; /* push %ss */ |
| buf[i++] = 0x0e; /* push %cs */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* Stack space for the collecting_t object. */ |
| i = 0; |
| i += push_opcode (&buf[i], "83 ec 08"); /* sub $0x8,%esp */ |
| |
| /* Build the object. */ |
| i += push_opcode (&buf[i], "b8"); /* mov <tpoint>,%eax */ |
| memcpy (buf + i, &tpoint, 4); |
| i += 4; |
| i += push_opcode (&buf[i], "89 04 24"); /* mov %eax,(%esp) */ |
| |
| i += push_opcode (&buf[i], "65 a1 00 00 00 00"); /* mov %gs:0x0,%eax */ |
| i += push_opcode (&buf[i], "89 44 24 04"); /* mov %eax,0x4(%esp) */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* spin-lock. Note this is using cmpxchg, which leaves i386 behind. |
| If we cared for it, this could be using xchg alternatively. */ |
| |
| i = 0; |
| i += push_opcode (&buf[i], "31 c0"); /* xor %eax,%eax */ |
| i += push_opcode (&buf[i], "f0 0f b1 25"); /* lock cmpxchg |
| %esp,<lockaddr> */ |
| memcpy (&buf[i], (void *) &lockaddr, 4); |
| i += 4; |
| i += push_opcode (&buf[i], "85 c0"); /* test %eax,%eax */ |
| i += push_opcode (&buf[i], "75 f2"); /* jne <again> */ |
| append_insns (&buildaddr, i, buf); |
| |
| |
| /* Set up arguments to the gdb_collect call. */ |
| i = 0; |
| i += push_opcode (&buf[i], "89 e0"); /* mov %esp,%eax */ |
| i += push_opcode (&buf[i], "83 c0 08"); /* add $0x08,%eax */ |
| i += push_opcode (&buf[i], "89 44 24 fc"); /* mov %eax,-0x4(%esp) */ |
| append_insns (&buildaddr, i, buf); |
| |
| i = 0; |
| i += push_opcode (&buf[i], "83 ec 08"); /* sub $0x8,%esp */ |
| append_insns (&buildaddr, i, buf); |
| |
| i = 0; |
| i += push_opcode (&buf[i], "c7 04 24"); /* movl <addr>,(%esp) */ |
| memcpy (&buf[i], (void *) &tpoint, 4); |
| i += 4; |
| append_insns (&buildaddr, i, buf); |
| |
| buf[0] = 0xe8; /* call <reladdr> */ |
| offset = collector - (buildaddr + sizeof (jump_insn)); |
| memcpy (buf + 1, &offset, 4); |
| append_insns (&buildaddr, 5, buf); |
| /* Clean up after the call. */ |
| buf[0] = 0x83; /* add $0x8,%esp */ |
| buf[1] = 0xc4; |
| buf[2] = 0x08; |
| append_insns (&buildaddr, 3, buf); |
| |
| |
| /* Clear the spin-lock. This would need the LOCK prefix on older |
| broken archs. */ |
| i = 0; |
| i += push_opcode (&buf[i], "31 c0"); /* xor %eax,%eax */ |
| i += push_opcode (&buf[i], "a3"); /* mov %eax, lockaddr */ |
| memcpy (buf + i, &lockaddr, 4); |
| i += 4; |
| append_insns (&buildaddr, i, buf); |
| |
| |
| /* Remove stack that had been used for the collect_t object. */ |
| i = 0; |
| i += push_opcode (&buf[i], "83 c4 08"); /* add $0x08,%esp */ |
| append_insns (&buildaddr, i, buf); |
| |
| i = 0; |
| buf[i++] = 0x83; /* add $0x4,%esp (no pop of %cs, assume unchanged) */ |
| buf[i++] = 0xc4; |
| buf[i++] = 0x04; |
| buf[i++] = 0x17; /* pop %ss */ |
| buf[i++] = 0x0f; /* pop %gs */ |
| buf[i++] = 0xa9; |
| buf[i++] = 0x0f; /* pop %fs */ |
| buf[i++] = 0xa1; |
| buf[i++] = 0x07; /* pop %es */ |
| buf[i++] = 0x1f; /* pop %ds */ |
| buf[i++] = 0x9d; /* popf */ |
| buf[i++] = 0x83; /* add $0x4,%esp (pop of tpaddr aka $pc) */ |
| buf[i++] = 0xc4; |
| buf[i++] = 0x04; |
| buf[i++] = 0x61; /* popad */ |
| append_insns (&buildaddr, i, buf); |
| |
| /* Now, adjust the original instruction to execute in the jump |
| pad. */ |
| *adjusted_insn_addr = buildaddr; |
| relocate_instruction (&buildaddr, tpaddr); |
| *adjusted_insn_addr_end = buildaddr; |
| |
| /* Write the jump back to the program. */ |
| offset = (tpaddr + orig_size) - (buildaddr + sizeof (jump_insn)); |
| memcpy (buf, jump_insn, sizeof (jump_insn)); |
| memcpy (buf + 1, &offset, 4); |
| append_insns (&buildaddr, sizeof (jump_insn), buf); |
| |
| /* The jump pad is now built. Wire in a jump to our jump pad. This |
| is always done last (by our caller actually), so that we can |
| install fast tracepoints with threads running. This relies on |
| the agent's atomic write support. */ |
| if (orig_size == 4) |
| { |
| /* Create a trampoline. */ |
| *trampoline_size = sizeof (jump_insn); |
| if (!claim_trampoline_space (*trampoline_size, trampoline)) |
| { |
| /* No trampoline space available. */ |
| strcpy (err, |
| "E.Cannot allocate trampoline space needed for fast " |
| "tracepoints on 4-byte instructions."); |
| return 1; |
| } |
| |
| offset = *jump_entry - (*trampoline + sizeof (jump_insn)); |
| memcpy (buf, jump_insn, sizeof (jump_insn)); |
| memcpy (buf + 1, &offset, 4); |
| write_inferior_memory (*trampoline, buf, sizeof (jump_insn)); |
| |
| /* Use a 16-bit relative jump instruction to jump to the trampoline. */ |
| offset = (*trampoline - (tpaddr + sizeof (small_jump_insn))) & 0xffff; |
| memcpy (buf, small_jump_insn, sizeof (small_jump_insn)); |
| memcpy (buf + 2, &offset, 2); |
| memcpy (jjump_pad_insn, buf, sizeof (small_jump_insn)); |
| *jjump_pad_insn_size = sizeof (small_jump_insn); |
| } |
| else |
| { |
| /* Else use a 32-bit relative jump instruction. */ |
| offset = *jump_entry - (tpaddr + sizeof (jump_insn)); |
| memcpy (buf, jump_insn, sizeof (jump_insn)); |
| memcpy (buf + 1, &offset, 4); |
| memcpy (jjump_pad_insn, buf, sizeof (jump_insn)); |
| *jjump_pad_insn_size = sizeof (jump_insn); |
| } |
| |
| /* Return the end address of our pad. */ |
| *jump_entry = buildaddr; |
| |
| return 0; |
| } |
| |
| static int |
| x86_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, |
| CORE_ADDR collector, |
| CORE_ADDR lockaddr, |
| ULONGEST orig_size, |
| CORE_ADDR *jump_entry, |
| CORE_ADDR *trampoline, |
| ULONGEST *trampoline_size, |
| unsigned char *jjump_pad_insn, |
| ULONGEST *jjump_pad_insn_size, |
| CORE_ADDR *adjusted_insn_addr, |
| CORE_ADDR *adjusted_insn_addr_end, |
| char *err) |
| { |
| #ifdef __x86_64__ |
| if (is_64bit_tdesc ()) |
| return amd64_install_fast_tracepoint_jump_pad (tpoint, tpaddr, |
| collector, lockaddr, |
| orig_size, jump_entry, |
| trampoline, trampoline_size, |
| jjump_pad_insn, |
| jjump_pad_insn_size, |
| adjusted_insn_addr, |
| adjusted_insn_addr_end, |
| err); |
| #endif |
| |
| return i386_install_fast_tracepoint_jump_pad (tpoint, tpaddr, |
| collector, lockaddr, |
| orig_size, jump_entry, |
| trampoline, trampoline_size, |
| jjump_pad_insn, |
| jjump_pad_insn_size, |
| adjusted_insn_addr, |
| adjusted_insn_addr_end, |
| err); |
| } |
| |
| /* Return the minimum instruction length for fast tracepoints on x86/x86-64 |
| architectures. */ |
| |
| static int |
| x86_get_min_fast_tracepoint_insn_len (void) |
| { |
| static int warned_about_fast_tracepoints = 0; |
| |
| #ifdef __x86_64__ |
| /* On x86-64, 5-byte jump instructions with a 4-byte offset are always |
| used for fast tracepoints. */ |
| if (is_64bit_tdesc ()) |
| return 5; |
| #endif |
| |
| if (agent_loaded_p ()) |
| { |
| char errbuf[IPA_BUFSIZ]; |
| |
| errbuf[0] = '\0'; |
| |
| /* On x86, if trampolines are available, then 4-byte jump instructions |
| with a 2-byte offset may be used, otherwise 5-byte jump instructions |
| with a 4-byte offset are used instead. */ |
| if (have_fast_tracepoint_trampoline_buffer (errbuf)) |
| return 4; |
| else |
| { |
| /* GDB has no channel to explain to user why a shorter fast |
| tracepoint is not possible, but at least make GDBserver |
| mention that something has gone awry. */ |
| if (!warned_about_fast_tracepoints) |
| { |
| warning ("4-byte fast tracepoints not available; %s\n", errbuf); |
| warned_about_fast_tracepoints = 1; |
| } |
| return 5; |
| } |
| } |
| else |
| { |
| /* Indicate that the minimum length is currently unknown since the IPA |
| has not loaded yet. */ |
| return 0; |
| } |
| } |
| |
| static void |
| add_insns (unsigned char *start, int len) |
| { |
| CORE_ADDR buildaddr = current_insn_ptr; |
| |
| if (debug_threads) |
| debug_printf ("Adding %d bytes of insn at %s\n", |
| len, paddress (buildaddr)); |
| |
| append_insns (&buildaddr, len, start); |
| current_insn_ptr = buildaddr; |
| } |
| |
| /* Our general strategy for emitting code is to avoid specifying raw |
| bytes whenever possible, and instead copy a block of inline asm |
| that is embedded in the function. This is a little messy, because |
| we need to keep the compiler from discarding what looks like dead |
| code, plus suppress various warnings. */ |
| |
| #define EMIT_ASM(NAME, INSNS) \ |
| do \ |
| { \ |
| extern unsigned char start_ ## NAME, end_ ## NAME; \ |
| add_insns (&start_ ## NAME, &end_ ## NAME - &start_ ## NAME); \ |
| __asm__ ("jmp end_" #NAME "\n" \ |
| "\t" "start_" #NAME ":" \ |
| "\t" INSNS "\n" \ |
| "\t" "end_" #NAME ":"); \ |
| } while (0) |
| |
| #ifdef __x86_64__ |
| |
| #define EMIT_ASM32(NAME,INSNS) \ |
| do \ |
| { \ |
| extern unsigned char start_ ## NAME, end_ ## NAME; \ |
| add_insns (&start_ ## NAME, &end_ ## NAME - &start_ ## NAME); \ |
| __asm__ (".code32\n" \ |
| "\t" "jmp end_" #NAME "\n" \ |
| "\t" "start_" #NAME ":\n" \ |
| "\t" INSNS "\n" \ |
| "\t" "end_" #NAME ":\n" \ |
| ".code64\n"); \ |
| } while (0) |
| |
| #else |
| |
| #define EMIT_ASM32(NAME,INSNS) EMIT_ASM(NAME,INSNS) |
| |
| #endif |
| |
| #ifdef __x86_64__ |
| |
| static void |
| amd64_emit_prologue (void) |
| { |
| EMIT_ASM (amd64_prologue, |
| "pushq %rbp\n\t" |
| "movq %rsp,%rbp\n\t" |
| "sub $0x20,%rsp\n\t" |
| "movq %rdi,-8(%rbp)\n\t" |
| "movq %rsi,-16(%rbp)"); |
| } |
| |
| |
| static void |
| amd64_emit_epilogue (void) |
| { |
| EMIT_ASM (amd64_epilogue, |
| "movq -16(%rbp),%rdi\n\t" |
| "movq %rax,(%rdi)\n\t" |
| "xor %rax,%rax\n\t" |
| "leave\n\t" |
| "ret"); |
| } |
| |
| static void |
| amd64_emit_add (void) |
| { |
| EMIT_ASM (amd64_add, |
| "add (%rsp),%rax\n\t" |
| "lea 0x8(%rsp),%rsp"); |
| } |
| |
| static void |
| amd64_emit_sub (void) |
| { |
| EMIT_ASM (amd64_sub, |
| "sub %rax,(%rsp)\n\t" |
| "pop %rax"); |
| } |
| |
| static void |
| amd64_emit_mul (void) |
| { |
| emit_error = 1; |
| } |
| |
| static void |
| amd64_emit_lsh (void) |
| { |
| emit_error = 1; |
| } |
| |
| static void |
| amd64_emit_rsh_signed (void) |
| { |
| emit_error = 1; |
| } |
| |
| static void |
| amd64_emit_rsh_unsigned (void) |
| { |
| emit_error = 1; |
| } |
| |
| static void |
| amd64_emit_ext (int arg) |
| { |
| switch (arg) |
| { |
| case 8: |
| EMIT_ASM (amd64_ext_8, |
| "cbtw\n\t" |
| "cwtl\n\t" |
| "cltq"); |
| break; |
| case 16: |
| EMIT_ASM (amd64_ext_16, |
| "cwtl\n\t" |
| "cltq"); |
| break; |
| case 32: |
| EMIT_ASM (amd64_ext_32, |
| "cltq"); |
| break; |
| default: |
| emit_error = 1; |
| } |
| } |
| |
| static void |
| amd64_emit_log_not (void) |
| { |
| EMIT_ASM (amd64_log_not, |
| "test %rax,%rax\n\t" |
| "sete %cl\n\t" |
| "movzbq %cl,%rax"); |
| } |
| |
| static void |
| amd64_emit_bit_and (void) |
| { |
| EMIT_ASM (amd64_and, |
| "and (%rsp),%rax\n\t" |
| "lea 0x8(%rsp),%rsp"); |
| } |
| |
| static void |
| amd64_emit_bit_or (void) |
| { |
| EMIT_ASM (amd64_or, |
| "or (%rsp),%rax\n\t" |
| "lea 0x8(%rsp),%rsp"); |
| } |
| |
| static void |
| amd64_emit_bit_xor (void) |
| { |
| EMIT_ASM (amd64_xor, |
| "xor (%rsp),%rax\n\t" |
| "lea 0x8(%rsp),%rsp"); |
| } |
| |
| static void |
| amd64_emit_bit_not (void) |
| { |
| EMIT_ASM (amd64_bit_not, |
| "xorq $0xffffffffffffffff,%rax"); |
| } |
| |
| static void |
| amd64_emit_equal (void) |
| { |
| EMIT_ASM (amd64_equal, |
| "cmp %rax,(%rsp)\n\t" |
| "je .Lamd64_equal_true\n\t" |
| "xor %rax,%rax\n\t" |
| "jmp .Lamd64_equal_end\n\t" |
| ".Lamd64_equal_true:\n\t" |
| "mov $0x1,%rax\n\t" |
| ".Lamd64_equal_end:\n\t" |
| "lea 0x8(%rsp),%rsp"); |
| } |
| |
| static void |
| amd64_emit_less_signed (void) |
| { |
| EMIT_ASM (amd64_less_signed, |
| "cmp %rax,(%rsp)\n\t" |
| "jl .Lamd64_less_signed_true\n\t" |
| "xor %rax,%rax\n\t" |
| "jmp .Lamd64_less_signed_end\n\t" |
| ".Lamd64_less_signed_true:\n\t" |
| "mov $1,%rax\n\t" |
| ".Lamd64_less_signed_end:\n\t" |
| "lea 0x8(%rsp),%rsp"); |
| } |
| |
| static void |
| amd64_emit_less_unsigned (void) |
| { |
| EMIT_ASM (amd64_less_unsigned, |
| "cmp %rax,(%rsp)\n\t" |
| "jb .Lamd64_less_unsigned_true\n\t" |
| "xor %rax,%rax\n\t" |
| "jmp .Lamd64_less_unsigned_end\n\t" |
| ".Lamd64_less_unsigned_true:\n\t" |
| "mov $1,%rax\n\t" |
| ".Lamd64_less_unsigned_end:\n\t" |
| "lea 0x8(%rsp),%rsp"); |
| } |
| |
| static void |
| amd64_emit_ref (int size) |
| { |
| switch (size) |
| { |
| case 1: |
| EMIT_ASM (amd64_ref1, |
| "movb (%rax),%al"); |
| break; |
| case 2: |
| EMIT_ASM (amd64_ref2, |
| "movw (%rax),%ax"); |
| break; |
| case 4: |
| EMIT_ASM (amd64_ref4, |
| "movl (%rax),%eax"); |
| break; |
| case 8: |
| EMIT_ASM (amd64_ref8, |
| "movq (%rax),%rax"); |
| break; |
| } |
| } |
| |
| static void |
| amd64_emit_if_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM (amd64_if_goto, |
| "mov %rax,%rcx\n\t" |
| "pop %rax\n\t" |
| "cmp $0,%rcx\n\t" |
| ".byte 0x0f, 0x85, 0x0, 0x0, 0x0, 0x0"); |
| if (offset_p) |
| *offset_p = 10; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| static void |
| amd64_emit_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM (amd64_goto, |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0"); |
| if (offset_p) |
| *offset_p = 1; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| static void |
| amd64_write_goto_address (CORE_ADDR from, CORE_ADDR to, int size) |
| { |
| int diff = (to - (from + size)); |
| unsigned char buf[sizeof (int)]; |
| |
| if (size != 4) |
| { |
| emit_error = 1; |
| return; |
| } |
| |
| memcpy (buf, &diff, sizeof (int)); |
| write_inferior_memory (from, buf, sizeof (int)); |
| } |
| |
| static void |
| amd64_emit_const (LONGEST num) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr = current_insn_ptr; |
| |
| i = 0; |
| buf[i++] = 0x48; buf[i++] = 0xb8; /* mov $<n>,%rax */ |
| memcpy (&buf[i], &num, sizeof (num)); |
| i += 8; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| } |
| |
| static void |
| amd64_emit_call (CORE_ADDR fn) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr; |
| LONGEST offset64; |
| |
| /* The destination function being in the shared library, may be |
| >31-bits away off the compiled code pad. */ |
| |
| buildaddr = current_insn_ptr; |
| |
| offset64 = fn - (buildaddr + 1 /* call op */ + 4 /* 32-bit offset */); |
| |
| i = 0; |
| |
| if (offset64 > INT_MAX || offset64 < INT_MIN) |
| { |
| /* Offset is too large for a call. Use callq, but that requires |
| a register, so avoid it if possible. Use r10, since it is |
| call-clobbered, we don't have to push/pop it. */ |
| buf[i++] = 0x48; /* mov $fn,%r10 */ |
| buf[i++] = 0xba; |
| memcpy (buf + i, &fn, 8); |
| i += 8; |
| buf[i++] = 0xff; /* callq *%r10 */ |
| buf[i++] = 0xd2; |
| } |
| else |
| { |
| int offset32 = offset64; /* we know we can't overflow here. */ |
| memcpy (buf + i, &offset32, 4); |
| i += 4; |
| } |
| |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| } |
| |
| static void |
| amd64_emit_reg (int reg) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr; |
| |
| /* Assume raw_regs is still in %rdi. */ |
| buildaddr = current_insn_ptr; |
| i = 0; |
| buf[i++] = 0xbe; /* mov $<n>,%esi */ |
| memcpy (&buf[i], ®, sizeof (reg)); |
| i += 4; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| amd64_emit_call (get_raw_reg_func_addr ()); |
| } |
| |
| static void |
| amd64_emit_pop (void) |
| { |
| EMIT_ASM (amd64_pop, |
| "pop %rax"); |
| } |
| |
| static void |
| amd64_emit_stack_flush (void) |
| { |
| EMIT_ASM (amd64_stack_flush, |
| "push %rax"); |
| } |
| |
| static void |
| amd64_emit_zero_ext (int arg) |
| { |
| switch (arg) |
| { |
| case 8: |
| EMIT_ASM (amd64_zero_ext_8, |
| "and $0xff,%rax"); |
| break; |
| case 16: |
| EMIT_ASM (amd64_zero_ext_16, |
| "and $0xffff,%rax"); |
| break; |
| case 32: |
| EMIT_ASM (amd64_zero_ext_32, |
| "mov $0xffffffff,%rcx\n\t" |
| "and %rcx,%rax"); |
| break; |
| default: |
| emit_error = 1; |
| } |
| } |
| |
| static void |
| amd64_emit_swap (void) |
| { |
| EMIT_ASM (amd64_swap, |
| "mov %rax,%rcx\n\t" |
| "pop %rax\n\t" |
| "push %rcx"); |
| } |
| |
| static void |
| amd64_emit_stack_adjust (int n) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr = current_insn_ptr; |
| |
| i = 0; |
| buf[i++] = 0x48; /* lea $<n>(%rsp),%rsp */ |
| buf[i++] = 0x8d; |
| buf[i++] = 0x64; |
| buf[i++] = 0x24; |
| /* This only handles adjustments up to 16, but we don't expect any more. */ |
| buf[i++] = n * 8; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| } |
| |
| /* FN's prototype is `LONGEST(*fn)(int)'. */ |
| |
| static void |
| amd64_emit_int_call_1 (CORE_ADDR fn, int arg1) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr; |
| |
| buildaddr = current_insn_ptr; |
| i = 0; |
| buf[i++] = 0xbf; /* movl $<n>,%edi */ |
| memcpy (&buf[i], &arg1, sizeof (arg1)); |
| i += 4; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| amd64_emit_call (fn); |
| } |
| |
| /* FN's prototype is `void(*fn)(int,LONGEST)'. */ |
| |
| static void |
| amd64_emit_void_call_2 (CORE_ADDR fn, int arg1) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr; |
| |
| buildaddr = current_insn_ptr; |
| i = 0; |
| buf[i++] = 0xbf; /* movl $<n>,%edi */ |
| memcpy (&buf[i], &arg1, sizeof (arg1)); |
| i += 4; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| EMIT_ASM (amd64_void_call_2_a, |
| /* Save away a copy of the stack top. */ |
| "push %rax\n\t" |
| /* Also pass top as the second argument. */ |
| "mov %rax,%rsi"); |
| amd64_emit_call (fn); |
| EMIT_ASM (amd64_void_call_2_b, |
| /* Restore the stack top, %rax may have been trashed. */ |
| "pop %rax"); |
| } |
| |
| void |
| amd64_emit_eq_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM (amd64_eq, |
| "cmp %rax,(%rsp)\n\t" |
| "jne .Lamd64_eq_fallthru\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lamd64_eq_fallthru:\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax"); |
| |
| if (offset_p) |
| *offset_p = 13; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| amd64_emit_ne_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM (amd64_ne, |
| "cmp %rax,(%rsp)\n\t" |
| "je .Lamd64_ne_fallthru\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lamd64_ne_fallthru:\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax"); |
| |
| if (offset_p) |
| *offset_p = 13; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| amd64_emit_lt_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM (amd64_lt, |
| "cmp %rax,(%rsp)\n\t" |
| "jnl .Lamd64_lt_fallthru\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lamd64_lt_fallthru:\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax"); |
| |
| if (offset_p) |
| *offset_p = 13; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| amd64_emit_le_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM (amd64_le, |
| "cmp %rax,(%rsp)\n\t" |
| "jnle .Lamd64_le_fallthru\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lamd64_le_fallthru:\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax"); |
| |
| if (offset_p) |
| *offset_p = 13; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| amd64_emit_gt_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM (amd64_gt, |
| "cmp %rax,(%rsp)\n\t" |
| "jng .Lamd64_gt_fallthru\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lamd64_gt_fallthru:\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax"); |
| |
| if (offset_p) |
| *offset_p = 13; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| amd64_emit_ge_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM (amd64_ge, |
| "cmp %rax,(%rsp)\n\t" |
| "jnge .Lamd64_ge_fallthru\n\t" |
| ".Lamd64_ge_jump:\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lamd64_ge_fallthru:\n\t" |
| "lea 0x8(%rsp),%rsp\n\t" |
| "pop %rax"); |
| |
| if (offset_p) |
| *offset_p = 13; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| struct emit_ops amd64_emit_ops = |
| { |
| amd64_emit_prologue, |
| amd64_emit_epilogue, |
| amd64_emit_add, |
| amd64_emit_sub, |
| amd64_emit_mul, |
| amd64_emit_lsh, |
| amd64_emit_rsh_signed, |
| amd64_emit_rsh_unsigned, |
| amd64_emit_ext, |
| amd64_emit_log_not, |
| amd64_emit_bit_and, |
| amd64_emit_bit_or, |
| amd64_emit_bit_xor, |
| amd64_emit_bit_not, |
| amd64_emit_equal, |
| amd64_emit_less_signed, |
| amd64_emit_less_unsigned, |
| amd64_emit_ref, |
| amd64_emit_if_goto, |
| amd64_emit_goto, |
| amd64_write_goto_address, |
| amd64_emit_const, |
| amd64_emit_call, |
| amd64_emit_reg, |
| amd64_emit_pop, |
| amd64_emit_stack_flush, |
| amd64_emit_zero_ext, |
| amd64_emit_swap, |
| amd64_emit_stack_adjust, |
| amd64_emit_int_call_1, |
| amd64_emit_void_call_2, |
| amd64_emit_eq_goto, |
| amd64_emit_ne_goto, |
| amd64_emit_lt_goto, |
| amd64_emit_le_goto, |
| amd64_emit_gt_goto, |
| amd64_emit_ge_goto |
| }; |
| |
| #endif /* __x86_64__ */ |
| |
| static void |
| i386_emit_prologue (void) |
| { |
| EMIT_ASM32 (i386_prologue, |
| "push %ebp\n\t" |
| "mov %esp,%ebp\n\t" |
| "push %ebx"); |
| /* At this point, the raw regs base address is at 8(%ebp), and the |
| value pointer is at 12(%ebp). */ |
| } |
| |
| static void |
| i386_emit_epilogue (void) |
| { |
| EMIT_ASM32 (i386_epilogue, |
| "mov 12(%ebp),%ecx\n\t" |
| "mov %eax,(%ecx)\n\t" |
| "mov %ebx,0x4(%ecx)\n\t" |
| "xor %eax,%eax\n\t" |
| "pop %ebx\n\t" |
| "pop %ebp\n\t" |
| "ret"); |
| } |
| |
| static void |
| i386_emit_add (void) |
| { |
| EMIT_ASM32 (i386_add, |
| "add (%esp),%eax\n\t" |
| "adc 0x4(%esp),%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| static void |
| i386_emit_sub (void) |
| { |
| EMIT_ASM32 (i386_sub, |
| "subl %eax,(%esp)\n\t" |
| "sbbl %ebx,4(%esp)\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t"); |
| } |
| |
| static void |
| i386_emit_mul (void) |
| { |
| emit_error = 1; |
| } |
| |
| static void |
| i386_emit_lsh (void) |
| { |
| emit_error = 1; |
| } |
| |
| static void |
| i386_emit_rsh_signed (void) |
| { |
| emit_error = 1; |
| } |
| |
| static void |
| i386_emit_rsh_unsigned (void) |
| { |
| emit_error = 1; |
| } |
| |
| static void |
| i386_emit_ext (int arg) |
| { |
| switch (arg) |
| { |
| case 8: |
| EMIT_ASM32 (i386_ext_8, |
| "cbtw\n\t" |
| "cwtl\n\t" |
| "movl %eax,%ebx\n\t" |
| "sarl $31,%ebx"); |
| break; |
| case 16: |
| EMIT_ASM32 (i386_ext_16, |
| "cwtl\n\t" |
| "movl %eax,%ebx\n\t" |
| "sarl $31,%ebx"); |
| break; |
| case 32: |
| EMIT_ASM32 (i386_ext_32, |
| "movl %eax,%ebx\n\t" |
| "sarl $31,%ebx"); |
| break; |
| default: |
| emit_error = 1; |
| } |
| } |
| |
| static void |
| i386_emit_log_not (void) |
| { |
| EMIT_ASM32 (i386_log_not, |
| "or %ebx,%eax\n\t" |
| "test %eax,%eax\n\t" |
| "sete %cl\n\t" |
| "xor %ebx,%ebx\n\t" |
| "movzbl %cl,%eax"); |
| } |
| |
| static void |
| i386_emit_bit_and (void) |
| { |
| EMIT_ASM32 (i386_and, |
| "and (%esp),%eax\n\t" |
| "and 0x4(%esp),%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| static void |
| i386_emit_bit_or (void) |
| { |
| EMIT_ASM32 (i386_or, |
| "or (%esp),%eax\n\t" |
| "or 0x4(%esp),%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| static void |
| i386_emit_bit_xor (void) |
| { |
| EMIT_ASM32 (i386_xor, |
| "xor (%esp),%eax\n\t" |
| "xor 0x4(%esp),%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| static void |
| i386_emit_bit_not (void) |
| { |
| EMIT_ASM32 (i386_bit_not, |
| "xor $0xffffffff,%eax\n\t" |
| "xor $0xffffffff,%ebx\n\t"); |
| } |
| |
| static void |
| i386_emit_equal (void) |
| { |
| EMIT_ASM32 (i386_equal, |
| "cmpl %ebx,4(%esp)\n\t" |
| "jne .Li386_equal_false\n\t" |
| "cmpl %eax,(%esp)\n\t" |
| "je .Li386_equal_true\n\t" |
| ".Li386_equal_false:\n\t" |
| "xor %eax,%eax\n\t" |
| "jmp .Li386_equal_end\n\t" |
| ".Li386_equal_true:\n\t" |
| "mov $1,%eax\n\t" |
| ".Li386_equal_end:\n\t" |
| "xor %ebx,%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| static void |
| i386_emit_less_signed (void) |
| { |
| EMIT_ASM32 (i386_less_signed, |
| "cmpl %ebx,4(%esp)\n\t" |
| "jl .Li386_less_signed_true\n\t" |
| "jne .Li386_less_signed_false\n\t" |
| "cmpl %eax,(%esp)\n\t" |
| "jl .Li386_less_signed_true\n\t" |
| ".Li386_less_signed_false:\n\t" |
| "xor %eax,%eax\n\t" |
| "jmp .Li386_less_signed_end\n\t" |
| ".Li386_less_signed_true:\n\t" |
| "mov $1,%eax\n\t" |
| ".Li386_less_signed_end:\n\t" |
| "xor %ebx,%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| static void |
| i386_emit_less_unsigned (void) |
| { |
| EMIT_ASM32 (i386_less_unsigned, |
| "cmpl %ebx,4(%esp)\n\t" |
| "jb .Li386_less_unsigned_true\n\t" |
| "jne .Li386_less_unsigned_false\n\t" |
| "cmpl %eax,(%esp)\n\t" |
| "jb .Li386_less_unsigned_true\n\t" |
| ".Li386_less_unsigned_false:\n\t" |
| "xor %eax,%eax\n\t" |
| "jmp .Li386_less_unsigned_end\n\t" |
| ".Li386_less_unsigned_true:\n\t" |
| "mov $1,%eax\n\t" |
| ".Li386_less_unsigned_end:\n\t" |
| "xor %ebx,%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| static void |
| i386_emit_ref (int size) |
| { |
| switch (size) |
| { |
| case 1: |
| EMIT_ASM32 (i386_ref1, |
| "movb (%eax),%al"); |
| break; |
| case 2: |
| EMIT_ASM32 (i386_ref2, |
| "movw (%eax),%ax"); |
| break; |
| case 4: |
| EMIT_ASM32 (i386_ref4, |
| "movl (%eax),%eax"); |
| break; |
| case 8: |
| EMIT_ASM32 (i386_ref8, |
| "movl 4(%eax),%ebx\n\t" |
| "movl (%eax),%eax"); |
| break; |
| } |
| } |
| |
| static void |
| i386_emit_if_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM32 (i386_if_goto, |
| "mov %eax,%ecx\n\t" |
| "or %ebx,%ecx\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t" |
| "cmpl $0,%ecx\n\t" |
| /* Don't trust the assembler to choose the right jump */ |
| ".byte 0x0f, 0x85, 0x0, 0x0, 0x0, 0x0"); |
| |
| if (offset_p) |
| *offset_p = 11; /* be sure that this matches the sequence above */ |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| static void |
| i386_emit_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM32 (i386_goto, |
| /* Don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0"); |
| if (offset_p) |
| *offset_p = 1; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| static void |
| i386_write_goto_address (CORE_ADDR from, CORE_ADDR to, int size) |
| { |
| int diff = (to - (from + size)); |
| unsigned char buf[sizeof (int)]; |
| |
| /* We're only doing 4-byte sizes at the moment. */ |
| if (size != 4) |
| { |
| emit_error = 1; |
| return; |
| } |
| |
| memcpy (buf, &diff, sizeof (int)); |
| write_inferior_memory (from, buf, sizeof (int)); |
| } |
| |
| static void |
| i386_emit_const (LONGEST num) |
| { |
| unsigned char buf[16]; |
| int i, hi, lo; |
| CORE_ADDR buildaddr = current_insn_ptr; |
| |
| i = 0; |
| buf[i++] = 0xb8; /* mov $<n>,%eax */ |
| lo = num & 0xffffffff; |
| memcpy (&buf[i], &lo, sizeof (lo)); |
| i += 4; |
| hi = ((num >> 32) & 0xffffffff); |
| if (hi) |
| { |
| buf[i++] = 0xbb; /* mov $<n>,%ebx */ |
| memcpy (&buf[i], &hi, sizeof (hi)); |
| i += 4; |
| } |
| else |
| { |
| buf[i++] = 0x31; buf[i++] = 0xdb; /* xor %ebx,%ebx */ |
| } |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| } |
| |
| static void |
| i386_emit_call (CORE_ADDR fn) |
| { |
| unsigned char buf[16]; |
| int i, offset; |
| CORE_ADDR buildaddr; |
| |
| buildaddr = current_insn_ptr; |
| i = 0; |
| buf[i++] = 0xe8; /* call <reladdr> */ |
| offset = ((int) fn) - (buildaddr + 5); |
| memcpy (buf + 1, &offset, 4); |
| append_insns (&buildaddr, 5, buf); |
| current_insn_ptr = buildaddr; |
| } |
| |
| static void |
| i386_emit_reg (int reg) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr; |
| |
| EMIT_ASM32 (i386_reg_a, |
| "sub $0x8,%esp"); |
| buildaddr = current_insn_ptr; |
| i = 0; |
| buf[i++] = 0xb8; /* mov $<n>,%eax */ |
| memcpy (&buf[i], ®, sizeof (reg)); |
| i += 4; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| EMIT_ASM32 (i386_reg_b, |
| "mov %eax,4(%esp)\n\t" |
| "mov 8(%ebp),%eax\n\t" |
| "mov %eax,(%esp)"); |
| i386_emit_call (get_raw_reg_func_addr ()); |
| EMIT_ASM32 (i386_reg_c, |
| "xor %ebx,%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| static void |
| i386_emit_pop (void) |
| { |
| EMIT_ASM32 (i386_pop, |
| "pop %eax\n\t" |
| "pop %ebx"); |
| } |
| |
| static void |
| i386_emit_stack_flush (void) |
| { |
| EMIT_ASM32 (i386_stack_flush, |
| "push %ebx\n\t" |
| "push %eax"); |
| } |
| |
| static void |
| i386_emit_zero_ext (int arg) |
| { |
| switch (arg) |
| { |
| case 8: |
| EMIT_ASM32 (i386_zero_ext_8, |
| "and $0xff,%eax\n\t" |
| "xor %ebx,%ebx"); |
| break; |
| case 16: |
| EMIT_ASM32 (i386_zero_ext_16, |
| "and $0xffff,%eax\n\t" |
| "xor %ebx,%ebx"); |
| break; |
| case 32: |
| EMIT_ASM32 (i386_zero_ext_32, |
| "xor %ebx,%ebx"); |
| break; |
| default: |
| emit_error = 1; |
| } |
| } |
| |
| static void |
| i386_emit_swap (void) |
| { |
| EMIT_ASM32 (i386_swap, |
| "mov %eax,%ecx\n\t" |
| "mov %ebx,%edx\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t" |
| "push %edx\n\t" |
| "push %ecx"); |
| } |
| |
| static void |
| i386_emit_stack_adjust (int n) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr = current_insn_ptr; |
| |
| i = 0; |
| buf[i++] = 0x8d; /* lea $<n>(%esp),%esp */ |
| buf[i++] = 0x64; |
| buf[i++] = 0x24; |
| buf[i++] = n * 8; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| } |
| |
| /* FN's prototype is `LONGEST(*fn)(int)'. */ |
| |
| static void |
| i386_emit_int_call_1 (CORE_ADDR fn, int arg1) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr; |
| |
| EMIT_ASM32 (i386_int_call_1_a, |
| /* Reserve a bit of stack space. */ |
| "sub $0x8,%esp"); |
| /* Put the one argument on the stack. */ |
| buildaddr = current_insn_ptr; |
| i = 0; |
| buf[i++] = 0xc7; /* movl $<arg1>,(%esp) */ |
| buf[i++] = 0x04; |
| buf[i++] = 0x24; |
| memcpy (&buf[i], &arg1, sizeof (arg1)); |
| i += 4; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| i386_emit_call (fn); |
| EMIT_ASM32 (i386_int_call_1_c, |
| "mov %edx,%ebx\n\t" |
| "lea 0x8(%esp),%esp"); |
| } |
| |
| /* FN's prototype is `void(*fn)(int,LONGEST)'. */ |
| |
| static void |
| i386_emit_void_call_2 (CORE_ADDR fn, int arg1) |
| { |
| unsigned char buf[16]; |
| int i; |
| CORE_ADDR buildaddr; |
| |
| EMIT_ASM32 (i386_void_call_2_a, |
| /* Preserve %eax only; we don't have to worry about %ebx. */ |
| "push %eax\n\t" |
| /* Reserve a bit of stack space for arguments. */ |
| "sub $0x10,%esp\n\t" |
| /* Copy "top" to the second argument position. (Note that |
| we can't assume function won't scribble on its |
| arguments, so don't try to restore from this.) */ |
| "mov %eax,4(%esp)\n\t" |
| "mov %ebx,8(%esp)"); |
| /* Put the first argument on the stack. */ |
| buildaddr = current_insn_ptr; |
| i = 0; |
| buf[i++] = 0xc7; /* movl $<arg1>,(%esp) */ |
| buf[i++] = 0x04; |
| buf[i++] = 0x24; |
| memcpy (&buf[i], &arg1, sizeof (arg1)); |
| i += 4; |
| append_insns (&buildaddr, i, buf); |
| current_insn_ptr = buildaddr; |
| i386_emit_call (fn); |
| EMIT_ASM32 (i386_void_call_2_b, |
| "lea 0x10(%esp),%esp\n\t" |
| /* Restore original stack top. */ |
| "pop %eax"); |
| } |
| |
| |
| void |
| i386_emit_eq_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM32 (eq, |
| /* Check low half first, more likely to be decider */ |
| "cmpl %eax,(%esp)\n\t" |
| "jne .Leq_fallthru\n\t" |
| "cmpl %ebx,4(%esp)\n\t" |
| "jne .Leq_fallthru\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Leq_fallthru:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx"); |
| |
| if (offset_p) |
| *offset_p = 18; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| i386_emit_ne_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM32 (ne, |
| /* Check low half first, more likely to be decider */ |
| "cmpl %eax,(%esp)\n\t" |
| "jne .Lne_jump\n\t" |
| "cmpl %ebx,4(%esp)\n\t" |
| "je .Lne_fallthru\n\t" |
| ".Lne_jump:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lne_fallthru:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx"); |
| |
| if (offset_p) |
| *offset_p = 18; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| i386_emit_lt_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM32 (lt, |
| "cmpl %ebx,4(%esp)\n\t" |
| "jl .Llt_jump\n\t" |
| "jne .Llt_fallthru\n\t" |
| "cmpl %eax,(%esp)\n\t" |
| "jnl .Llt_fallthru\n\t" |
| ".Llt_jump:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Llt_fallthru:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx"); |
| |
| if (offset_p) |
| *offset_p = 20; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| i386_emit_le_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM32 (le, |
| "cmpl %ebx,4(%esp)\n\t" |
| "jle .Lle_jump\n\t" |
| "jne .Lle_fallthru\n\t" |
| "cmpl %eax,(%esp)\n\t" |
| "jnle .Lle_fallthru\n\t" |
| ".Lle_jump:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lle_fallthru:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx"); |
| |
| if (offset_p) |
| *offset_p = 20; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| i386_emit_gt_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM32 (gt, |
| "cmpl %ebx,4(%esp)\n\t" |
| "jg .Lgt_jump\n\t" |
| "jne .Lgt_fallthru\n\t" |
| "cmpl %eax,(%esp)\n\t" |
| "jng .Lgt_fallthru\n\t" |
| ".Lgt_jump:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lgt_fallthru:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx"); |
| |
| if (offset_p) |
| *offset_p = 20; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| void |
| i386_emit_ge_goto (int *offset_p, int *size_p) |
| { |
| EMIT_ASM32 (ge, |
| "cmpl %ebx,4(%esp)\n\t" |
| "jge .Lge_jump\n\t" |
| "jne .Lge_fallthru\n\t" |
| "cmpl %eax,(%esp)\n\t" |
| "jnge .Lge_fallthru\n\t" |
| ".Lge_jump:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx\n\t" |
| /* jmp, but don't trust the assembler to choose the right jump */ |
| ".byte 0xe9, 0x0, 0x0, 0x0, 0x0\n\t" |
| ".Lge_fallthru:\n\t" |
| "lea 0x8(%esp),%esp\n\t" |
| "pop %eax\n\t" |
| "pop %ebx"); |
| |
| if (offset_p) |
| *offset_p = 20; |
| if (size_p) |
| *size_p = 4; |
| } |
| |
| struct emit_ops i386_emit_ops = |
| { |
| i386_emit_prologue, |
| i386_emit_epilogue, |
| i386_emit_add, |
| i386_emit_sub, |
| i386_emit_mul, |
| i386_emit_lsh, |
| i386_emit_rsh_signed, |
| i386_emit_rsh_unsigned, |
| i386_emit_ext, |
| i386_emit_log_not, |
| i386_emit_bit_and, |
| i386_emit_bit_or, |
| i386_emit_bit_xor, |
| i386_emit_bit_not, |
| i386_emit_equal, |
| i386_emit_less_signed, |
| i386_emit_less_unsigned, |
| i386_emit_ref, |
| i386_emit_if_goto, |
| i386_emit_goto, |
| i386_write_goto_address, |
| i386_emit_const, |
| i386_emit_call, |
| i386_emit_reg, |
| i386_emit_pop, |
| i386_emit_stack_flush, |
| i386_emit_zero_ext, |
| i386_emit_swap, |
| i386_emit_stack_adjust, |
| i386_emit_int_call_1, |
| i386_emit_void_call_2, |
| i386_emit_eq_goto, |
| i386_emit_ne_goto, |
| i386_emit_lt_goto, |
| i386_emit_le_goto, |
| i386_emit_gt_goto, |
| i386_emit_ge_goto |
| }; |
| |
| |
| static struct emit_ops * |
| x86_emit_ops (void) |
| { |
| #ifdef __x86_64__ |
| if (is_64bit_tdesc ()) |
| return &amd64_emit_ops; |
| else |
| #endif |
| return &i386_emit_ops; |
| } |
| |
| static int |
| x86_supports_range_stepping (void) |
| { |
| return 1; |
| } |
| |
| /* This is initialized assuming an amd64 target. |
| x86_arch_setup will correct it for i386 or amd64 targets. */ |
| |
| struct linux_target_ops the_low_target = |
| { |
| x86_arch_setup, |
| x86_linux_regs_info, |
| x86_cannot_fetch_register, |
| x86_cannot_store_register, |
| NULL, /* fetch_register */ |
| x86_get_pc, |
| x86_set_pc, |
| x86_breakpoint, |
| x86_breakpoint_len, |
| NULL, |
| 1, |
| x86_breakpoint_at, |
| x86_supports_z_point_type, |
| x86_insert_point, |
| x86_remove_point, |
| x86_stopped_by_watchpoint, |
| x86_stopped_data_address, |
| /* collect_ptrace_register/supply_ptrace_register are not needed in the |
| native i386 case (no registers smaller than an xfer unit), and are not |
| used in the biarch case (HAVE_LINUX_USRREGS is not defined). */ |
| NULL, |
| NULL, |
| /* need to fix up i386 siginfo if host is amd64 */ |
| x86_siginfo_fixup, |
| x86_linux_new_process, |
| x86_linux_new_thread, |
| x86_linux_prepare_to_resume, |
| x86_linux_process_qsupported, |
| x86_supports_tracepoints, |
| x86_get_thread_area, |
| x86_install_fast_tracepoint_jump_pad, |
| x86_emit_ops, |
| x86_get_min_fast_tracepoint_insn_len, |
| x86_supports_range_stepping, |
| }; |
| |
| void |
| initialize_low_arch (void) |
| { |
| /* Initialize the Linux target descriptions. */ |
| #ifdef __x86_64__ |
| init_registers_amd64_linux (); |
| init_registers_amd64_avx_linux (); |
| init_registers_amd64_avx512_linux (); |
| init_registers_amd64_mpx_linux (); |
| |
| init_registers_x32_linux (); |
| init_registers_x32_avx_linux (); |
| init_registers_x32_avx512_linux (); |
| |
| tdesc_amd64_linux_no_xml = xmalloc (sizeof (struct target_desc)); |
| copy_target_description (tdesc_amd64_linux_no_xml, tdesc_amd64_linux); |
| tdesc_amd64_linux_no_xml->xmltarget = xmltarget_amd64_linux_no_xml; |
| #endif |
| init_registers_i386_linux (); |
| init_registers_i386_mmx_linux (); |
| init_registers_i386_avx_linux (); |
| init_registers_i386_avx512_linux (); |
| init_registers_i386_mpx_linux (); |
| |
| tdesc_i386_linux_no_xml = xmalloc (sizeof (struct target_desc)); |
| copy_target_description (tdesc_i386_linux_no_xml, tdesc_i386_linux); |
| tdesc_i386_linux_no_xml->xmltarget = xmltarget_i386_linux_no_xml; |
| |
| initialize_regsets_info (&x86_regsets_info); |
| } |